Nesting Instinct

Chapter 4: A Miscalculation of Risk

“You see, I told you. No one ho- Oh! H- uh... hi... Bridget.”

Ava tries to smile through her panic. She had expected to be home alone, with ample time to spend fooling around with her girlfriend Kaylin before anyone else got back. Instead, she walks through the front door to find her stepmother sitting at the dining room table, idly sipping a mug of tea and looking through some paperwork.

Bridget looks up at them as the two girls stand in the doorway, raising a single eyebrow. “Hello,” she greets back, setting down the mug. “And who is this?”

Kaylin, who has always been more bold than Ava, sneaks in around her and bounces up to Bridget, holding her hand out to shake. “Hey there!” she says, her voice bubbly and cheerful. “I’m Kaylin. Nice to finally meet you!”

Bridget smiles and accepts the handshake as Ava tries to force down her nerves at watching the two of them interact. “So, this is the famous Kaylin?” Bridget asks. She is, to Ava’s relief, smiling. Considering the main thing Bridget knows about Kaylin is that she was willing to fool around with Ava in public at school, a cordial interaction is more than she thought she could hope for. She tries to smile back in a way that doesn’t communicate that she knows that Bridget knows that she’s wearing the toy that was purchased for her, a discreet, low-profile silicone insert that is even now whirring away inside her vagina.

“Uh, don’t mind us,” Ava says quickly, afraid of what might happen if the two of them spend too much time talking. Kaylin has always been sexually adventurous, and isn’t the best at keeping her mouth shut. “We’re just going to go hang out in my room, if that’s cool?”

“Sure,” says Bridget, waving a hand at them before turning back to her papers. “Let me know if you want a snack or something.”

Ava smiles and grabs Kaylin’s hand, practically dragging her to the bedroom and closing the door behind them. She feels relieved as it clicks shut, but also somewhat disappointed. She’d been looking forward to having the house to themselves. She sighs and leans back against the door.

“Awww, Babe, what’s the matter?” Kaylin asks. She stands in front of Ava, taking Ava’s hands in her own and pulling them around her, placing one on her buttock and the other on her breast. Her long blond hair frames a heart-shaped face with a seductive expression. She nestles close, pressing herself up against Ava’s body with obvious intent.

“What are you doing?” Ava hisses, alarmed.

With Ava’s hands now where she wants them, Kaylin slides her own around Ava’s waist and begins to pull her slowly backwards, towards the bed. “What does it look like I’m doing?” she asks, teasing. “Isn’t this what we came here for?”

“We can’t!” Ava protests in a whisper. “With Bridget right there? She’ll hear us!”

“So?” Kaylin says impishly. Her thighs hit the bed and she lays back, pulling Ava down on top of her. “Why would she care? She doesn’t mind you having sex, right? Didn’t she get you this little number?” Kaylin reaches between Ava’s legs and grinds her palm into the base of the sex toy currently lodged inside her. Ava groans involuntarily.

She hasn’t told Kaylin about her sexual encounters with Bridget or her sister, because Bridget asked her not to. But there was no way Kaylin wasn’t going to notice the vibrator while they were fooling around, so she’d had to come clean about that. Ava has always been absolutely terrible at lying, so she’d opted for the closest to the truth she felt she could get away with: her stepmother had bought it for her after they’d gotten caught at school, in the hopes of helping her be less horny and therefore less inclined towards risky sexual escapades.

Kaylin lies back again, but brings her knee up between Ava’s legs so she can continue to apply pressure. Ava grinds against her helplessly, enjoying the pressure on both the vibrator and her cock. They’re both still in their school uniforms, so there’s only the thin layer of Ava’s panties between their flesh. Grinning, Kaylin tilts her head so she can whisper in Ava’s ear. “Isn’t it more exciting this way?” she murmurs. “Knowing that your stepmother might come in at any moment and catch us?” She leans upward to nibble lightly on Ava’s earlobe, drawing out a moan. “Maybe she could join us?” she suggests, eyes sparkling.

She can’t possibly know the truth behind what she’s suggesting. Ava feels her face heat up; doubtless she’s bright red right now. She can’t help it. She knows what her stepmother’s cock feels like inside her; the memory is as fresh as the first time it happened.

“Hah,” Kaylin laughs at her, but it’s a teasing, fond laugh. “I knew you had a crush on her!”

“Sh-shut up!” Ava protests. She retaliates by thrusting a hand up Kaylin’s skirt and grinding her own palm against her girlfriend’s nethers. Kaylin moans, distracted. Ava leans down to kiss her, silencing her properly.

Ava loves kissing Kaylin. It’s one of her favorite things in the world. Kaylin is always soft and accommodating, welcoming her, drawing in her tongue and straining her body up towards Ava, as though she’s hoping that Ava will somehow melt into her, merging them. She’s always like this; compliant, submissive, and then—usually when Ava least suspects it—adding in a dash of mischief.

They take their time getting undressed, indulging long, sloppy, tongue-twining kisses between each article of clothing. Ava is hard as hell, but she’s trying to follow what Bridget taught her and focus on her pussy more than her cock. She’s already orgasmed from that orifice several times throughout the day, quietly and unobtrusively, tiny tremors rocking her body as she came while taking her English test, or in the cafeteria at lunch, or on the bus ride home. Her dick is impatient, but she does her best to ignore it.

Not that Kaylin makes it easy for her. “Come on, Baby,” her girlfriend whispers underneath her. “I want you in me. Fuck me, please?”

Ava is all too happy to comply. They finish taking off the last of their clothes—Ava’s underwear and Kaylin’s bra—and slot themselves back together. Kaylin’s breasts are not quite as large as Ava’s, but they are still soft and giving, spilling out over her chest. She’s also wet as hell; her thighs are drenched with desire, ready and waiting for her penetration.

Ava grabs Kaylin’s legs under each knee and lifts them up and apart, positioning herself at Kaylin’s entrance. With a sigh of relief, she lines herself up and pushes her cock into the warm, wet softness. Kaylin’s slick hole offers no resistance at all, and Ava slides in deep, like coming home.

“Yessss,” Kaylin hisses. “That’s it. Fuck me. Fuck me hard.”

“Quiet!” Ava protests, even as she complies and begins to thrust into Kaylin’s body. “She’ll hear you!”

“So?” Kaylin asks, apparently unable to keep herself from teasing. “Isn’t that what you want? Dear ol’ stepmom, hearing you in the throes of pleasure, deciding to come join the party?” She’s making no effort to lower her voice, and it’s entirely possible Bridget can hear her from the dining room, only one thin wall away.

“Shush!” Ava tries again, desperate. She lets go of one of Kaylin’s legs to lift a hand up to her girlfriend’s mouth, covering it. Her thrusts become somewhat erratic as they wrestle for control, although they do not stop.

But Kaylin merely turns her head to the side, escaping the covering. She grins and opens her mouth, and Ava just knows she’s not going to like what comes next.

“Oh yeah!” Kaylin cries out loudly. “Oh yeah, Bridget! Do me! I’ve always wanted you to fuck me, stepmommy! Come and put it in!”

Panic swamping her, Ava tries desperately to reach for Kaylin to slap a hand back over her mouth once more. When that proves futile due to the way she keeps squirming and tossing her head, Ava changes tactic.

She sits up and lifts her hips, raising them both up enough that she can reach under herself. In one swift motion she grabs the base of the vibrator embedded within her and yanks it out of herself, hitting the switch on the base to turn it off.

Then, without further warning, she leans forward once more over Kaylin, takes the used sex toy, and shoves it into her open and laughing mouth.

Kaylin’s eyes go wide. She instinctively relaxes her throat, and instead of the merely shoving the head of the toy between her lips as Ava had expected, the entire length of the artificial cock slides down her gullet, embedding in her until only the toy’s base can be seen in the middle of the surprised “O” formed by her lips. Ava grins triumphantly, watching Kaylin’s throat convulse around the toy.

Her victory is short-lived, however, because a moment later the door opens behind her.

Ava turns to look over her shoulder, terrified, and finds exactly what she most feared: her stepmother, standing frowning in the doorway. Ava is simultaneously mortified and unbelievably aroused. Her recently vacated pussy twitches with desire. Stunned into stillness, Ava looks back at Kaylin, meeting her wide and astonished eyes. It’s clear even without words that Kaylin had not expected her teasing to have real consequences. Ava once again turns to look at Bridget.

Because she’s not watching, she misses the way that Kaylin moves.

As much as she can from her position, Kaylin reaches down and grabs one of Ava’s thighs in each hand. She lifts her girlfriend’s hips at the same time as she pulls the flesh apart, displaying Ava’s dripping nethers for Bridget in a clear invitation.

Ava turns back to her, too late. Bridget is already coming up behind her. Ava barely has time for a hurried, “W-wait, are you sure-” before her stepmother has reached the bed, her pants already unzipped and cock out, eager to join in the fun. All Ava can do is moan as her stepmother takes one of her buttocks in each hand and lifts her up high enough to position her over the spike of her cock before lowering her again, letting Ava’s own weight impale her.

Ava groans at the familiar feeling of her stepmother’s massive cock filling her. The toy has been good, it’s doing its job, but it’s still nothing compared to being stretched by the real thing. She leans forward, feeling herself sandwiched between the firm muscle of her stepmother behind her and the softer, more pliant thighs of her girlfriend in front.

Bridget starts to move, setting the pace, fucking Ava into her girlfriend. It’s all Ava can do to let herself be along for the ride. She looks back at Kaylin, who makes direct eye contact with her and reaches up to the sex toy in her mouth. Grasping the base in both hands, she begins to pull it out of her throat, but stops before she does so completely. Without breaking Ava’s gaze, she begins to fuck her face with it in time to the thrusts, groaning wantonly around it.

“Fu-” Ava starts to swear, then stops herself. It seems crazy that she’s still worried about swearing in front of her stepmother with the woman’s cock drilling her over and over, but somehow the habit is hard to break. “That’s so hot,” she moans instead.

Bridget leans down against her back, sandwiching her more tightly between the two women. “I thought you deserved a reward,” she murmurs, “for listening to me and taking your sex lives somewhere private.”

‘Clearly not as private as I thought,’ Ava thinks but doesn’t say. She doesn’t want to give the impression that she’s not happy with the outcome, as Bridget continues to ram home inside her.

She leans down to lick at Kaylin’s neck, pressing their breasts together and feeling the pulse of their bodies moving alongside each other in rhythm with Bridget’s thrusts. Closing her lips, she sucks a hickey at the join of Kaylin’s shoulder and neck, possessive.

At the pressure, Kaylin’s hips begin to buck. Ava feels her passage clenching around her cock, milking her, stroking her inside as she comes, tightening and loosening in waves. Her lower body rises up, taut and rigid, shaking as her orgasm pulses through her on and on.

When she finally subsides, falling back to the bed, Bridget backs off long enough for Ava to pull out. Ava is still hard, herself, but she feels a pleased sense of accomplishment, regardless.

Kaylin reaches up and pulls the dildo out of her mouth with a lewd wet noise, sighing in pleasure. “Holy shit, that was good,” she says. Her eyes dart to Bridget, shyly, but she doesn’t acknowledge her directly. Ava’s stepmother still has the head of her cock buried inside her stepdaughter, although she’s no longer moving.

“Want another one?” Ava asks, knowing that Kaylin rarely wants to stop at just one orgasm.

“Go down on me?” Kaylin suggests.

Bridget moves to make good on the suggestion before Ava can. She backs away, pulling out of Ava, and drags her stepdaughter down onto her hands and knees, pushing her face down between her girlfriend’s legs. Then she lifts up Ava’s hips and resumes her previous actions, once more slipping her wet cock between Ava’s swollen nether lips and breaching her, sliding forward until she’s balls-deep inside the girl. She picks her rhythm back up as though she’d never left, fucking Ava in long, deep thrusts that sheath her all the way in the pliant young body.

Ava tries to focus on using her tongue, slipping it up into Kaylin and thrusting with it before pulling it back out to lap up and down across her clit and then repeating the process. She knows how Kaylin likes it; her girlfriend fists her hands in her hair in approval.

But it’s hard to concentrate. Not only are Bridget’s thrusts deep and inexorable, moments later she skates a thumb through the slick leavings around Ava’s penetration and then raises it up, pushing the digit lightly against the tight pucker of her asshole.

The moment Bridget’s thumb pops into her ass, Ava’s pussy comes. She feels herself clench around the cock fucking her just as her rectum spasms around the invasive finger. She groans, the vibrations traveling along her tongue into her girlfriend’s own pussy, as her orgasm shakes her hips. Bridget fucks her through it, never slowing, picking up the rhythm with her thumb as well as she forces it shallowly over and over into Ava’s ass.

“Oh fuck,” Kaylin moans beneath her. “That’s so fucking hot.”

Ava scowls, somehow suddenly embarrassed at showing this kind of vulnerability in front of her girlfriend, not to mention what Bridget must think. In revenge, she copies her stepmother’s actions; she backs up long enough to stick two fingers up her girlfriend’s pussy, getting them nice and wet, before lowering them and pushing them gloatingly up her ass.

Kaylin groans at the penetration. “Hey!” she protests, the sound ending as a squeak as Ava ends the motion with both digits buried inside her up to the last knuckle.

Ava gathers a bit of bravado about her, feeling inexplicably like she needs to show off for Bridget’s benefit, for some reason. “Just be glad it’s only the fingers,” she teases. “We have a perfectly wet sex toy here I could be shoving up there.”

Kaylin’s eyes widen. Glancing down at Ava, she quickly grabs up the used toy before anyone else can and shoves it back in her mouth. Throwing her head back, she proceeds to fellate it wantonly, groaning around it as though it’s the only thing she wants. Ava gulps and then resumes her previous attentions, lapping once more at Kaylin’s pussy while now fingering her ass as well.

She does her best to match Bridget’s more mature motions as her stepmother continues to fuck her, although she’s definitely not quite as good at it. It’s also difficult to focus with all her orifices occupied. She swallows and wonders if Kaylin is having similar difficulties.

For a long time she loses herself in the sensations; the taste of her girlfriend on her tongue, the feeling of two penetrations as her ass and pussy are worked simultaneously. She wants to touch her cock as well, but she holds off, knowing she won’t be able to last long once she starts. Instead she continues until she comes again with her holes, once again clenching around her stepmother as her hips tighten and go rigid, pleasure washing through her.

Bridget doesn’t let up, fucking her and fucking her, not removing the thumb from her ass, even after her orgasm. It’s all Ava can do to hold on for many more long minutes as she continues to be assaulted with sensation from all sides. Kaylin comes next, bucking up against her mouth as another orgasm ripples through her. Finally, moments later, she feels another orgasm behind her, Bridget’s balls twitching as she fills her stepdaughter with seed. As she does so she reaches around Ava’s hips to her cock and begins to pump her: long, tight pulls of her fist in time with the pulses of her orgasm.

It’s all Ava can take; she comes herself, splattering over the bed-spread, the orgasm washing over her with blinding light, seizing her whole body. She rips her fingers out of Kaylin’s behind so she can clench her fists in the blankets, holding on for dear life. Bridget’s hands are an anchoring point, as they hold her hips steady to better flood her with semen. She gasps, unable to breath, as thumb and cock penetrate her simultaneously as deep as they can, her own cock twitching helplessly in the open air.

When Bridget finally lets her go, she collapses beside Kaylin, heaving deep, gulping lungfuls of air. Bridget is breathing hard too, although she’s much more in control of it than the two teens.

Finally, Bridget stands up, tucking herself back into her pants and straightening her clothes. She clears her throat. “It was a pleasure to meet you, Kaylin,” she says formally. Ava thinks she hears a hint of embarrassment in her voice, but it’s hard to be sure. She’s too exhausted to look up at her.

She hears the door click shut as Bridget leaves and at least manages to crane her neck enough to look up at Kaylin. The girl looks just as shell-shocked as her. At least she’s taken the sex toy out of her mouth.

“Holy shit,” Kaylin whispers down to her.

“You okay?” Ava checks.

Kaylin pauses, but nods. “What the fuck?” she hisses. “I didn’t think she’d actually do it!”

Ava shrugs. She still doesn’t want to tell her about the previous encounters; not until Bridget says it’s alright. But now that she knows this much...

“We, uh...” Ava swallows. “We could probably get her to do it again sometime, if you wanted to.”

Kaylin blinks. She doesn’t immediately say no. Her expression is thoughtful.

Ava looks back down, pillowing her head against Kaylin’s thigh. She’s too exhausted to think of the future much right now anyway. She just wants to rest before they have to get dressed again. She definitely doesn’t want to still be in this state when Amelia gets home.