Comply with her request

You stand up without saying anything and walk over to your sister, and then you give your answer by grabbing her head and kissing her deeply.

"Thank you, Big Brother," she says.

You pick her up by her nice plump behind, with her wrapping her legs around your torso. You begin carrying her to your bunk, all the while you make out with this gorgeous woman and your sister, not caring who sees you.

You throw Rachel down on the soft bunk, and she bounces playfully on the bed laughing. You take off your personal suit and through that into a corner of the room.

"My Big Brother truly is my BIG Brother," she says, emphasizing the second big.

"All the better to play with" you smirk.

You put your arms on both sides of your sister and stare deeply into her eyes, wait to see what she will do.

She waits and twists seductively "You just going to wait there or will I have to do all the work," She says, teasing you.

She then leans forward first kissing you, and she grabs your head in an attempt to put up down towards her. You oblige, forcing her to spread her legs, welcoming your now extremely rigid cock. You feel her soft lips upon you own, it feels wrong, but at the same time, it feels so right.

"I've always known you would be my first," she says into your mouth, the heat and humidity building around your mouth.

Your hands reach up and caress her large breasts, taking her bra off with a simple push and throwing it into the same corner as your own clothes. You move downwards and flit your tongue over her right nipple.

"How many women have you had, Brother?" she asks as she moans softly.

"Some" you blush and smirk, it's not exactly a lie.

You pull your pelvis more into her own, your penis laying gently against her pussy. You move to the other nipple paying attention to that one this time.

"I want you," she moans.

"I know," you retort, "beg for it."

"I want you," she begs you.

"What do you want?" you laugh and begin rubbing your hard penis against her labia all the while picking up the teasing of her breasts.

"I want you to fuck me," she begs nearly pleading.

"Who am I? And what do you want me to do?" you slow down and pull away slightly.

"I want my big brother to fuck me.." she is now pleading.

"Oh, that can be arranged," you laugh with heavy breath.

You back away pulling you own underwear cleanly off throwing it cleanly aside; however, you offer no such mercy and slowly pull her now soaked panties off of her body, going slowly down the legs as she shivers in anticipation. By the time you have pulled them off, she is trembling like a newborn deer.

"Are you ready little sister?" you ask.

"Yes big brother I'm ready" she moans out trying not to go through it again.

You are more than happy to oblige as you begin to push just the tip into your sister's moist cunt. You feel her hymen, and so you gently drive past it. As you do so, you see her wince a bit, but that is shortly replaced by her moaning.

"Ohhh," she moans.

You continue a steady pace of entering her, you really have to hold yourself back as she is so wet you could probably go all the way with a slight push.

"Ohh-" she moans, you interrupt her by kissing her, hoping not to attract the attention of others.

That does not stop her; instead, it is making her, moan, into your mouth, god your sister is a screamer. You finally go all the way into her, the feeling is amazing

You begin to slowly go in and out only to be greeted by yet more moaning into your mouth. You move your hands up and begin to caress Rachel's breasts. As you start to pick up the pace slowly, you feel the moans in your mouth get louder, forcing you to take Rachel's hands off of her breasts and cover your sister's mouth. Eventually, you feel her cunt begin to constrict, and your sister writhes underneath you. Finally, she recomposes herself, and you return to kissing her as a method of keeping her quiet.

You continue to build up the pace going faster, you feel yourself getting ever closer to your own orgasm, as Rachel again becomes louder and louder, watching her large breasts move back and forth nearly touching her face.

As her cunt begins to constrict again as she orgasms, you feel yourself about to release your own cum.

If you cum in her, she may become pregnant or do you not want to take the chance.