Take it, but try to get some concessions at least

"One condition, " you say, to Sam's obvious approval. "You're not really in a position to make demands here, Cindy." "You want two slaves, right? That's the entire reason you're doing this. This is the best chance you're going to get, and you'll be guaranteed at least one. So shut up and listen." Sam considers this for a second, then nods. "Add a clause to my WIN condition that I can't get pregnant. I know it will only apply once my GAME with Mandy is over, since GAME's can't interfere like that. But assuming you help me win that, I want to be absolutely guaranteed to get through this year child-free."

"Done, " Sam says, without hesitation. "To be honest, I don't really want a kid, myself. Not yet, at least. And think of me what you will, but even I'm not cruel enough to let someone else knock you up. So, you win, and you'll be my entirely sterile **** for a year and a day. Deal?" "Deal." Sam rolls onto his back beside you with his hands clasped behind his head. "Great! Of course, as we agreed, the GAME only begins once I pump even more cum into you, so I suggest you get started." After a second of confusion, you ask, "What?" "There's nothing in the terms about me doing any of the work. To be honest, I don't really care what you do, though for your sake I suggest it ends with me cumming deep inside your pussy."

This guy is just fucking unbelievable. And you're going to be stuck with him for a year! It's the lesser evil at the moment, though... So now the only question is how to get him off. You could just jack him off until right when he's about to cum, then stick it in as briefly as possible. Or, you could ride him properly and get something out of it yourself. He does have a seriously nice cock, after all... Either way, the result will be the same, like it or not.