You and Crystal continue having sex

You both listen and wait but hear nothing again.

"Now where were we?" She says as she reaches up to tickle your sides causing you to giggle and lean forward. Before you know it your lips are pressed against hers and the two of you are softly making out while her cock continues to rub against your back side. With your new posture her cock now slides between your cheeks which become slick from her precum. You have never really kissed anyone like this before and doing so eradicates all of your nervousness while Crystal lightly rubs her cock between the globes of your ass. You turn your ass up so that your pucker is in a position to be rubbed completely by her pole. You both break off the kiss to grin at each other when she realizes what you're doing.

After some time you lean back against her thighs which are now propped up and remark "God, you have such a hot body."

"Enjoying the view?" She says.

"Yes! I'm loving this." The colder air in the bedroom is contrasted to the heat you feel from her skin as you sit on her lower stomach which causes you to smile inwardly because you can also feel the heat of her body where your balls are resting on her skin. You lean down to run your hands over her rib cage and gently cup her full breasts noting how small her areola become when her nipples are erect.

You feel as though looking at her body and touching it would never get old. You try to take a mental snap shot of this moment, her form laying underneath you, the way her auburn hair is splayed out over her pillow. She has now placed her arms up with her fingers interlaced behind her head watching you as you enjoy your explorations of her body. You remember that her cock is now out in the open and you want to get a close look at it too.

"Can we turn a light on?"

"Sure." She says while leaning over to flip on the lamp on her bed side table. You are now very curious to see her cock so you lift your leg over her so that you're spooning against her again with your head resting on her stomach facing her towering penis. The shape of it is beautiful as you run your finger tips around its base and start to grasp the shaft. You've been able to feel your own cock your entire life but touching hers is something new entirely. The sexual power in her organ in unmistakable.

You are surprised as she suddenly sits up and places her hands on your sides encouraging you to scoot up the bed until she is propped up over you with her hips in between your legs while her cock rests heavily on you. You wrap your legs around her waist, loving the feeling of her body weight pressing down on your hips. You then pull her body toward you more with your legs causing her cock to slide forward over your torso.

"You love my cock, don't you?" She asks.

You say nothing but your nervous smiles gives away the answer.

"You've gotten me so horny, I need you again! Here, lube me up." She says while motioning to the bottle of lube on her night stand.

You grab the clear bottle and with a quick squeeze have enough lube to slather over her cock as well as your ass. Once you have applied the lube you look between your legs and can only focus on the way her rod glistens from the lamplight, it looks impossibly erect, almost straining in the cold air while it lightly bobs up and down from her movements. You know of a much warmer place it could be.

Crystal then places her mushroom against your slick opening. She teases you by pushing against you and almost entering you before pulling back. She does this for awhile as you can't help but lean your head back and close your eyes while moaning. It is a struggle to remain quiet. With your eyes closed you begin to feel her apply pressure again until your pucker opens up to swallow the mushroom head of her cock. From Crystal's perspective she can see sphincter almost swell outward before enveloping the tip of her cock. At this point Crystal is nearly powerless to resist her lust filled instincts for penetrating you. She does manage some control as she slowly slides a few inches into you at a time before being able to drive the entire length into your upturned ass. Her large ball sack makes a solid connection to your ass, the feeling drives you wild as you realize you've again taken the entirety of your sister's rod.

You're surprised at how easily you ass swallows her cock to the hilt, the feeling of being penetrated is incredible and the walls of your opening are hyper sensitive allowing you to feel each pleasurable inch of her cock pass into you. Her cock is so long that, as she slowly penetrates you, your feeling of fullness just keeps expanding as you feel her deep in your body. The soft and yet hard texture of her cock rubs your ass in ways that make you shudder.

Crystal has now laid fully over your body with her head turned down next to yours. She takes your ear into her mouth and nibbles on it while sighing in pleasure, the sound is intensified due to her proximity.

"Ugh, Doug, your ass feels amazing! I don't know how I'm going to leave you alone after tonight, I need you in my bed every night from now on so I can always sink my cock into your ass like this!" she says while half moaning in pleasure.

"You're so big!" You can only manage to say in reply.

Crystal now takes a hold of both of your shoulders from under your back and squeezes your entire body, pulling you down into her groin causing your ass spread even wider which allows another half inch of her shaft to be **** into you. You feel so small compared you her body as she arches over while slowly pulling back and thrusting her cock into you. Your hands become wrapped around her back along with your legs around her waist. Pretty soon you're only along for the ride as you feel her animal passion start to build and she begins thrusting in earnest. Her breath comes in hot puffs on your neck and you can hear the wet sound of her cock sliding in and out of you along with the soft noise her balls make as they impact your ass with each thrust. The groans of pleasure coming from her as she squeezes your body drive you crazy!

"Oh, Dougie, your ass is amazing! You're going to make me come inside you, you're going to be swollen with it when I'm finished" She says.

Hearing her say this along with the friction of her stomach over your cock nearly causes you to orgasm. With each deep thrust of her cock you feel a warm diffusing pleasure spread from your entire groin until the sensation focuses and explodes. You ass begins to uncontrollably ripple and grasp the many inches of her cock gliding in and out of you. Your cock starts spraying cum between your stomachs in several pulses.

You hold on tight because you can tell she is really pounding into you now, she is building her way up to orgasm, the groaning and gasping in your ear never stops.

"Oh my god, Doug, I'm going to cum!" She warns.

You can feel her balls tighten up against your butt as her her entire body strains against you with her cock impossibly deep inside you. Her shaft jerks as you feel the first blast of her cum shoot inside you. You can sense its warmth in you as she lightly humps into you again depositing another shot of semen deeper inside you. You always knew that girls were incredibly virile compared to guys, but you were amazed when your sister breathlessly held onto you and continued to pump you full of her load for such a long time that she did indeed cause your stomach to swell with her seed.

After some time her orgasm finished and she lay there panting on top of you with her cock still lodged just as deeply as before.

You couldn't stop smiling while thinking about how you just reduced your older sister to a sweaty, groaning mess with your ass. She must really enjoy fucking you! Your ass is slightly sore from the pounding she gave you but it still tingles with the pleasure of being filled with her rod. Once again, you are surprised by how much you wanted her cock and enjoyed feeling it penetrate you. You marvel at how much of a slut you're becoming and think that it's going to get you into trouble but for now you're going to enjoy your sisters cocks as much as you can.

Later the two of you disengage and clean up before cuddling with her spooning you against her larger frame all night.