Her asshole

Nikki leans in. And then that face, that face that you've known for so long, that grown so accustomed to lusting after says, "I want you in my asshole."

You feel like you're in a porno, except all the stars are people you know, and everything is 10 times more awkward and 100 times hotter. You can't even respond. But you nod.

Nikki smiles back. "You'd always hoped I was naughty didn't you? Well, I mean, you could probably always tell that I was a bad girl, but you'd always hoped that I was a very, very bad girl." Your cousin takes some of the soapy lather that's on her hands from jerking your cock and you can see her slip it behind her between her ass cheeks. "I fucking love getting it in the ass. I'm telling you I've been fucked in the ass by more guys than your pretty girlfriend has probably even spoke to in her life. But I've certainly never done anything a dirty as fucked my cousin." She turns around and bends down, giving you a good view of her skinny but shapely ass, then reaching behind here and spreading her cheeks for you. "C'mon, help me do the dirtiest thing I've ever done."

Her pale flesh and eager asshole are too much for you to resist. Not that you would have even tried. And you lean in, holding up your throbbing cock, and push it inside her.

"Ooooh fuck" she let's out a primal declaration as you start to thrust at her. Then she keeps going, soft enough to almost be talking to herself, but you can hear. "As deep as possible." She mutters. "As deep as possible."

Her ass wrapped around your cock is magnificent. You reach down and put a hand on her wet flesh. The shower is running lukewarm water now. But you don't care. You do your best to hold your slippery cousin in place as you thrust yourself as deep as possible.

You feel Katie peering around you. "What's she saying?" She whispers.

"As deep as possible" you say, smiling, feeling proud that you've reduced your wild child cousin to a mess of blubbering passion.

"That's so fucking hot." Katie responds.

You're not sure if now is a good time to clarify what was said earlier but you can't help but want to be sure everything tonight goes flawless. "Listen..." you whisper. "I know you're not really into..."

"Whatever you do to her. I want you to do to me." Katie interrupts seeming very determined. You wonder if maybe there's a bit of jealousy or competitiveness going on. "Look at me." She insists and her face reads not even that she's trying to be horny or wild, but that she's trying to comfort any concerns you may have. "It's okay. We're going to do whatever we want tonight and it's going to be okay. Anything is on the table." Then her serious comfort face turns into a big smile.

"I.... heard... that." Nikki chimes in, panting very heavily. "Do you... mean it?"

Katie pauses for just one slight moment, then with total confidence answers. "Yes!" adding. "Whatever turns him on. Or turns you on too dear."

"Holy shit" Nikki says between gritted teeth, reacting to how you feel inside her. You wonder if she's even heard what your girlfriend said. But she did.

"In that... case.... how about..."