Yes and it turns out better than you could have ever hoped!

With her pussy still wide open, you take her implied challenge right away. You press your member against her tight hole, teasing her a bit.

"Between you and your sister, I'm ready to go," Melanie says, "Fuck me!"

You smirk and give her a light smack on her right cheek. Before she can react, you thrust your cock into the hole fully-now. You get about half of your length in with just this one thrust. She grunts.

"I know how that feels," Lexi says, kissing Melanie's neck like was done to her.

You rub Melanie's tight thighs, still bent forward by Lexi's hands, and push your way in further. You meet little resistance, which is a bit surprising. She's not that much of a slut is she?

"Don't slow down," Mel says, "I do Core and Kegel Exercises every day."

That explains it, you think, as you keep on pushing. You practically have your balls pushing against her tight ass now. Within seconds, you do.

"Did you fill her up," Lexi asks, "She sounds happy."

"Oh yeah," Melanie replies, "He's all up inside me. Give it to me now!"

Not one to ignore a request like that, you start to pound her. With a grip on her athletic legs, it is easy to really fuck her hard.

For the next several minutes, the room fills up with the sound of grunts and moans as you engage in some passionate fucking with Lexi's exotic friend Melanie. The fact that Lexi is mounted on top of her kissing her breasts is a great bonus!

"I love it," Melanie says, "I can't take much more. Rub my clit like I did Lexi's."

You read enough websites and saw enough pictures to have a good idea of where it is. You move one hand slowly down her thigh and move back the 'hood' at the top of her pussy. You find a little nub and rub it quickly.

"That's it! I'm cumming! I'm cum-mmph!"

Her exclamation is interrupted as Lexi kisses her full on the lips. Melanie's body shakes and shudders with orgasm. The fact that her body is bent so awkwardly and her body so controlled is apparently a big turn-on for her.

You pull out of her once she's done with her explosive orgasm and Lexi climbs off of her as well. Your step-sister turns to you and starts to suck your dick, wanting to taste the combination of her juices and Mel's.

When she's done, she looks up at you with a smile.

"You didn't cum in either of us," she says, "Good control. I bet Mel's reward will be worth it."

"You have no idea," she says, putting something behind the pillow when you two look at her.

Moments later, you hear the door knob jiggle. You remember locking it, which is probably for the best. However...

Whoever is out there has a key and opens it. You wait tensely as you see...

The topless pair of Diddy and Justine, smiling like the cat that got the canary.

"What are you two doing here," Lexi asks, genuinely-curious.