Fuck her

You quickly take off her tank top and panties, then take off your own clothes. You continue to kiss her, as you take aim with your dick. You want to be gentle with her, probably some part of the brotherly protectiveness, as you continue to fondle her breasts. She moans into your mouth as you do this.

Slowly penetrating her, you feel her soft walls. She seems tight, but she's obviously not a virgin. Slowly pushing forward, you enjoy the feeling of her pussy while kissing her. She responds by playing with your balls, as she continues to moan. You enjoy having sex with your perfect sister. It continues like this for some time until you are balls deep inside of her.

Once you penetrate her completely, you start to thrust into her. You stop kissing while you do this, but play more with her breasts, slightly pinching her nipples and massaging them. Kelly is moaning loudly from the pleasure.

"Oh, James, this is so good! I love you!", Kelly screams in her pleasure. This makes you happy as you continue to fuck her. Her tight pussy is slowly bringing you closer to cumming. The pleasure you give Kelly finally brings her over the edge and she orgasms.

"Oh, god, yes!", she screams as her pussy clenches around your dick. You were not expecting it, and it also brings you over the edge. You fill your sister with cum as her athletic body is shaken by a mind-blowing orgasm. You groan in pleasure as this happens.

Once you both are done, you lay over her, your dick still inside of her. You both are panting heavily. After a while of resting, you’re finally able to pull out and stand up. Kelly also gets up.

"So, bro, next time you want this sweet little body, you know you just have to ask", she tells you with a mischievous smile before she pulls you in for a last kiss. You push your tongue inside of her mouth and briefly wrestle with hers, beating her easily. You then pull back.

"Message received, Kel", you tell her before leaving. You wonder what to do now.