You Need To Fuck Her. (Ass)

You walked right behind her letting your dick poke and rub against her ass, "Jen I need to cum." You whispered into her ear,

"Later John I need to finish up so I can't blow you right now." Jen said not at all fazed by what you were doing,

"I know but I don't want you to blow me." You said grabbing her ass,

Jen looked at you visibly embarrassed and shocked, "You want to, I mean I'm your sister John."

"Yeah so what." You said crouching down so you were level with Jen's ass,

"Are you sure we should be doing this?" Jen asked biting her lower lip,

"Yes." You said pulling her panties down and spreading her cheeks. You pushed forward and began licking he asshole. You couldn't stop thinking about fucking your sister's tight little ass so you quickly began lubing it up,

"Oh fuck John what are you doing?" Jen asked between quiet moans,

"This." You said standing up and putting your dick right onto her asshole,

"Wait! Don't-" Jen started to say but you plunged into her ass causing her to yell out in shock, pleasure and pain all at the same time. You slammed into your sister's ass without thinking, all you could focus on was the pleasure of her tightness around your shaft, "Oh my god your dick is in my ass. My brother's dick is fucking my ass. My brother is ass fucking me!" Jen said to herself in shock, causing you to be even more turned on.

You grabbed onto Jens hair and pulled it causing Jen's head to fall back. Jen let out yell's of pure pleasure at this point as your slammed the full length of your dick into her tight ass. Your balls began to tighten and your dick started to pulse and twitch. You looked at your sister who's face was beat red from pleasure and some shock, you now just wanted to choose where to cum.