You can't really say no

You look again towards Lucy, catching her looking at where Rob's body is still joined with yours. Having recovered from the initial shock of her walking in on you like this, you realise she must have been in bed, as she is standing there in just a short nightie. It barely covers her at all, just coming down over her ass, and thin enough you can make out her nipples through it.

Behind you Rob's cock is still semi-hard inside you. You glance again at the mirror and see he is also looking over at your best friend, and you wonder if that is part of the reason his cock is still in its current state.

"Well Dani?" Rob asks, breaking the silence that had fallen between the three of you. Again you look to Lucy, and see the same shock in her face as it dawns on her he is deadly serious.

"I'm not sure it is really up to me is it?" you finally speak as your eyes meet with Lucy's. She looks back at you, then again at Rob, and you can see her almost licking her lips. "Jesus Lucy, you are a horny slut ain't you" you laugh as it becomes so clear she won't be saying no.

As if realising the same thing, Rob finally eases himself away from you. His cock slips from inside you with a small pop and you feel his cum flow over your lips and down your thighs. Automatically you grab a tissue from the desk in front of you and reach down to wipe it up. Even as you do you notice Lucy's eyes move again, and you smile as you realise she is staring at Rob's cock as he is now standing back from you on full display to her.

"So you said you needed ten minutes to recover didn't you Rob?" Lucy asks with a grin. "How bout I help make it five?" As she says that she grabs the hem of her nightie and lifts it over her head, revealing what you already knew, that she was naked underneath.

"Fuck" you hear Rob mutter as he stares at her. "You sure you ok with this Dani?" You look back nodding, knowing you can't say no now, even if you wanted.

"Just three conditions" you inform him. "One, that I get your cock again later. Two, you are so sleeping in my bed when you are done, and three..."