"All three of us."

Rebecca says, "Well, Kat and I have both now had our first orgasm, but you haven't. I say all three of us. With this little change, I propose a rule change. Now we will each say what part of yours we want, and you will state one each for us. Since you are the birthday boy, so to speak, then you will tell us what we're doing. Okay?"

Everyone nods.

Kat says, "I dibs going first!" She giggles and you all join in. "And I dibs your cock!" You grin at her boldness. You are so ready, with your shaft tenting your boxers.

Rebecca says, "I want your mouth. If I'd gone first, I'd have taken your cock too."

They both look at you with a burning lust in their eyes. You've got to be the luckiest guy on the planet, with these two deliciously beautiful girls wanting your body for sex.