Just a little shower sex between half-siblings (Y)

"Mmm....give me that dick, baby. Let me show you what happens when you resist temptation." Zoe grinds her big squishy ass against your crotch, pumping on your cock almost without any input from you. You chuckle to yourself at the irony of resisting temptation. Are you really resisting temptation, right now?

She looks back, a wicked grin on her face as she pulls her wet hair over one shoulder. "Spread my cheeks, Jimmy. Take my dirty asshole. It's all yours."
Well, since she's asking so nicely....
"Mmm!!! Okay.......fuuuck...." she's lost in pleasure now as your fight your way into her tight, but strangely yielding balloon knot. Her face twists up in a mix of pleasure and pain, though the mix is heavily favoring the pleasure side of the equation.
"Fuuuuuuckkk!!!!!" she shudders as you spear deeper and deeper, until her hungry asshole grips your cock at the base, and your head nestles somewhere in the warm, squishy confines of her rectum. Her back hallway is incredible: squeezing and stimulating you like a cunt. She's a talented buttslut, apparently. "I guess there's no hiding...mmmmfff.... that I prefer it in my ass...." her eyes are rolling wildly as she grips her nipples. "Fuck me."
You pound her for a few minutes, but despite her wild screams and lewd encouragements, the stimulation is a little too much, and you can't make it happen.
You finish up the shower, and as you dry off, strolling into the bedroom, you are greeted by Jenna. She's standing in the bedroom, arms folded, regarding you both with an amused and annoyed expression.
"Oh...h-hey Jenna...." Zoe pipes up with a stupid grin. Suddenly, she's the one with the guilty expression.