You decline to up the ante

Reggie squinted his eyes at the girls and shook his head, asking, "I'm not sure, I'd get to fuck both of you right?" He looked at both girls and projected some more. "YOU TWO ARE GETTING HORNIER AND WANT TO START IT RIGHT NOW. YOU TWO ARE GETTING ATTRACTED TO EACH OTHER BUT DON'T WANT TO DO ANYTHING WITHOUT HIM THERE. HE'S THE ONLY GUY WHO CAN HELP YOU OUT RIGHT NOW SO BEG AND OFFER HIM SEXUAL FAVORS. OFFER TO DO STUFF EVEN IF YOU DON'T LIKE IT."

Wendy blinks her eyes and whispers to Michelle but in a voice you can overhear, "But I don't want to cheat on Nate. Even if we're practicing, it'd be cheating." Michelle elbows Wendy and whispers, "Don't ruin this. It's for Nate's benefit." Reggie projects to Wendy, "YOU DON'T DO ANAL WITH NATE SO DOING ANAL WITH THIS GUY WOULDN'T BE CHEATING SINCE NATE HASN'T GOTTEN YOUR ASS EITHER. OFFER TO LET HIM FUCK YOUR ASS."

Wendy then opens her eyes at you and says, "Please? I have a boyfriend so sex with me is off the table. It'd be just Michelle but what if I let you fuck me in the ass since he doesn't do that with me?" Reggie sighs and says, "Maybe if I could fuck you both in the ass, maybe, I don't know..."

You see Michelle's tits start to harden and she quickly responds, "Please? Not just my ass and my pussy, I'm single so all three of my holes are yours. You can do anything with me."

Reggie shakes his head again and sighs, adding, "But it would just be Wendy's - is that right? - ass and you and that's just for a little while, right? I mean, I do have other things I could be doing...."

Michelle jumps back in and continues, "What if I agree to be your sex slave for the weekend? Better yet, for the entire week? Wendy can cover for me in class notes and I promise that she'll spend every free second she's not in class or with Nate practicing with us. You can do anything to me: tie me up, spank me, fuck me in public, I'll even fuck another guy if you order me to do so. Complete sex slave. We should be good to go with Nate by next Saturday, right Wendy?"

Reggie smiles and says, "Ok, ok, I don't want to drive a hard bargain. Let's play it by ear instead of a set time. Wendy's ass and all of Michelle's holes are mine until I think you two are ready for Nate. A week may be good but it may take some more time especially if Wendy isn't around for me to thoroughly rip apart her ass. Michelle, don't worry, I will use your body every way possible but I do worry about Wendy's schedule. One more thing though and I think we're good to get going."