Later that evening when Momma wants to return the favour while Lyra pretends to be asleep

Your heart is still pounding with adrenaline coursing through your body with what you just did with your Momma, with your Mother and Lyra swimming in the lake nearby. Unlike all your times with your Sister, where you went along with things, it felt so much more illicit to be the one making that first move, your skin is still tingling hours later when the taste of your Momma's cum is just a memory. You better understand your Sister's enthusiasm now, you can see why she's keen to win your parent's acceptance of your taboo love by getting them involved.

"Wow, I really didn't think you get into it so quickly," Lyra jokes while back in your tent, changing from the swimwear.

"Nor me," You reply with a giggle. "It felt so different being the one instigating the forbidden steps," You add with a big smile.

"Yeah it's a hell of a rush," Lyra confirms with a smile. "It does fade in intensity, but it's still there each time we hook up," Lyra adds pulling you in for a big hug.

"That's good to know," You reply with a grin. "Although, I'm not sure what to do next, do I go back to Momma and tease her more?" You ask.

"Feel free to tease her where you can, subtly at dinner around the camp, but wait for Momma to make the next move," Lyra explains. "That way it'll be harder for her to try and rationalise her way out of it since you both sought each other out," Your Sister adds expertly.

"Wow, that sounds a little manipulative," You reply.

"Well, you are trying to pull down some societal barriers to get at the delicious forbidden fruit," Lyra explains with a rueful smile. "Methods aren't great, but hell if the results aren't worth it," She adds with a sensual purr, her hands reaching down and giving your butt a big squeeze.

"Did you do this with me?" You ask, looking up at your Younger Sister.

"A little, I sort of got a little impatient when I saw you again, rushed a few steps, because I wanted to make you feel loved after such a rough patch," Lyra explains in a soft tone.

"That's sort of sweet, I think", You reply with a soft giggle.

With the next stage of the plan out of your hands outside of sneaking some looks your Momma's way, playfully licking your lips while she watches, you enjoy the vacation at its face value. The trip is nice and nostalgic with the promise of things to come giving it all an extra layer of spice, you enjoy a nice hike through a familiar trail, sharing memories as a group. You have a nice campfire stew to round off the evening, although now both you and Lyra are old enough you get to enjoy the stew with some beers.

You even enjoy some illicit fun skinny dipping in the lake in the moonlight with Lyra which quickly evolves into her fucking you in the lake until you feel her warmth spread through your unprotected pussy. A new type of swimming is now taking place inside your womb as the fresh wave of your Sister's futa sperm joins the race to break the ultimate taboo and start a new life inside of you. The pair of you collapsing into a heap in your tent after mostly drying yourself off.

Fortunately, while you're sleeping when you receive a surprise visit from Momma Genevieve, Lyra is a lighter sleeper and when she hears footsteps growing closer, she untangles herself from your hot naked form. By the time Genevieve is slowly unzipping the entrance to the tent, Lyra is lying away from you, giving your Momma just enough space to get up to whatever mischief she has planned for you. Lyra feigns sleep, wishing she'd spent the time she wanted setting up more hidden cameras, but equally looking forward to silently jerking off while listening to you and Momma getting up to some sneaky fun.

"Sweetie," Momma Genevieve says in a soft tone as she gently shakes your leg. "Are you awake for Momma?" She adds her tone growing in volume slightly as her tone grows more sultry.

"Momma?" You reply blearily, blinking as you're slowly pulled out of your slumber. "What are you doing here?" You ask softly, although, from the prominent bulge in the shorts she's wearing, Momma Genevieve is wearing you know exactly what she has in mind.

"I couldn't sleep sweetie, I couldn't stop thinking about what you did for me earlier," Momma Genevive replies, peeling the covers off your legs, revealing more and more of your naked form.

"Naughty Momma," You reply with a giggle, "Although I've been thinking about it too," You add with a low giggle, you glance over at Lyra who opens a single eye and nods and smiles before returning to her feigned sleep.

"I can tell, you look so juicy for Momma," Genevive replies licking her lips

"I've been soaking wet all day thinking about it," You reply hoping this might explain any of the mess from your Sister's cum that lingers.

"Mind if Momma returns the favour?" Genevive asks with a grin.

"I'd love that," You reply with a big smile.

Wasting no time Genevive simply hooks your legs over her shoulders and she slides forward, her hot breath washing over your sticky slick folds sending a shiver of anticipated pleasure through your core. You feel your Momma's lips on your thighs as Genevieve takes a few moments to tease you by kissing around your pussy, each kiss drawing your Momma closer and closer to your sex. When you finally feel your Momma's lips on your sweet lower lips you let out a low gasp of pleasure, which stretches into a moan when you feel your Momma's tongue run up and along your inner lips and flicking your swollen clit with a flourish.

"Careful, Sweetie," Genevive cautions in a low sultry tone. "Wouldn't want to wake your Sister, would we?" She adds with a low chuckle before returning her mouth to your sex.

"Sorry, Momma," You apologize, "But it feels too good," You add, letting out a softer moan of pleasure as Genevive begins to kiss, lick and suck your pussy lips.

Lyra watches on, no longer needing to be quite so subtle with her own movements now your Momma was very much entirely focused on you and driving you wild with her tongue. Lyra;scock aches and throbs as she slowly strokes herself watching your squirm and mewl in pleasure, as her own mother devours the pussy she fucked and filled not too many hours ago. The thought of her Momma tasting her cum mixed with yours drives Lyra wild and gets her own juices flowing from her sadly too often neglected pussy.

Using your pillow to muffle your moans and groans of pleasure, you can focus more on enjoying the wonderful sensation of your Momma worshipping your pussy. Your younger Sister is good at eating you out, but Genevive is off the scale, the things your Momma can do with her tongue are unlike anything you've felt before. You definitely hope it's a talent she can pass on to Lyra, assuming your Sister's audacious plan to get your parents involved in your forbidden fun comes true.

Before long your Momma's expert tongue has you cumming hard, in several back-to-back orgasms, causing you to soak the bedding, your Momma's face and even some of the tent. Your entire body is shaking from the orgasms a slight ache in your back and legs from all the spasming and the less-than-forgiving hard surface rather than a soft mattress, although the pleasure definitely outweighs the pain.

Before you really have time to come down from your intense orgasm, your Momma is on top of you, the lips that were moments ago pleasuring your juicy pussy now pressing against your lips. You're a little caught off guard suddenly having your Momma climb on top of you and passionately kiss you, but you eagerly return the kisses, tasting yourself on her lips. You enjoy the new feeling, taking ample opportunity to run your hands over your Momma's body and get a good handful of her ass through the thin material of her shorts.

"Oh Sweetie, you get your Momma really worked up," Genevive growls seductively in your ear.

"I can feel it," You reply in a soft whisper, feeling your Momma's hardness pressing into your hip through the thin material of her shorts.

"Fuck I can't resist you," Genevive purrs, giving you one last kiss, before rolling off your and tearing off her shorts.

"What about Lyra?" You ask with a teasing tone.

"I don't care if she wakes up, I want this too much to stop," Genevive replies climbing back on top of you, her now exposed cock lying heaving on top of your flat stomach.

"Good to know," You reply with a giggle before moving your head up so your lips are next to your Momma's ear. "But I meant what about Lyra, would you be able to resist her too?" You ask in a soft sensual whisper.

"Oh Sweetie," Genevive purrs softly. "Don't tease Momma like that," She adds, her cock twitching between your bodies, precum leaking down from the swollen crown and onto your body. The warm sticky fluid makes you think of the millions and millions of your Sister's potent swimmers eagerly racing around in your womb eager to knock you up. You feel a slight pang of sorrow knowing you might not be able to feel your Momma inside you tonight seeing as she hasn't stopped to check if she needs protection. You also doubt in the heat of the moment if Momma Genevive would pull out if you asked her to.

"Maybe she might like the taste of forbidden fruit?" You reply with a soft whisper.

The teasing proves too much for your Momma, she pushes you back and lowers herself down your body until her big hard cock is at the right angle, just one small movement from either of you and the line would be crossed. You glance over at Lyra and see the pleasure on her face, she's urging you to go on. Although in the brief look at your Younger Sister, you suddenly are struck by a thought.

Your Momma grips the base of her swollen shaft stroking it a couple of times, a bead of precum forming at the very tip as she takes aim for your sweet slippery folds. However, just before your Momma's cock reaches its target your hand reaches down and blocks access to your defenceless pussy. Your Momma looks up at you with a mixture of confusion and hunger on her face.

"We can't," You say in a soft apologetic tone. "At least not yet," You add softly. "Although I think you'll enjoy the alternative just as much," You conclude sitting up and planting a big kiss on your Momma's lips.