No... but you kind of want to.

You can feel the heat rising in your cheeks. Zoe is a sexy, wild girl, there's no denying it. It's very easy to just forget that she's your half-sister. There's not much of Frank in her.
"Even if I wanted to..." you do, you really do, you realize. "I have to go."
"Booo...." Zoe wiggles her ass in the air like a cat, putting on a pouty face. "For a second there, I was excited that I might finally get some of that good dick I saw going into Jenna yesterday..."
You swallow hard. Is it hot down here? Sweat is beading on your forehead. "Yes, well... just cut that shit out, would you? I'm happy to give you a place to crash, but I can't have you doing things like this."
"Okay... if that's what you really...want...." she punctuates every word as she locks eyes with you, swaying over to her duffel bag and pulling out a razor and some shaving cream. "Go enjoy your golf, Jimmy. I'm gonna shower and smooth up. Maybe I'll see you later..." she stops to give you a kiss on the lips, running away before you can stop her. She had pressed a hand to your crotch, too, and there had been no hiding the rock hard boner from her touch.
You shake your head in frustration as you pack your golf clubs into the trunk of the Javelin, and head out to the golf course.