He makes her a promise, and a possibly ill advised bet.

"If you're thinking about going all the way, I'm still not quite there," Izuku told her, making her pout slightly. "...but I think we can do it soon."

"How soon, Master?" Momo asked, kneeling down between his legs, easily settling for giving him a blowjob. As she fished his cock out, she gave his shaft a lick.

Izuku sighed in pleasure, letting her stimulate him. "...I'm thinking around the time we truly extend the offer to Ochaco. Whether she accepts or rejects the idea. It will either be a celebration of her acceptance, or a consolation prize for you," he joked light heartedly. "...but I promise, I'll be ready by then."

"Heh, I still got 100,000 yen saying it will be a celebration of that," Momo grinned, licking his balls as she stroked his shaft.

"Again, don't have that kind of money burning a hole in my trousers..." Izuku replied. "Seriously, do you not know how much money that is? You're a textbook definition of "spoiled sweet,"" he noted, referring to a trope that defined someone who was kind of spoiled, but turned out to be a kind and compassionate person regardless, just a bit naive to certain aspects of the world.

"... it's not THAT much is it?" Momo pouted slightly as she fondled his balls and kept licking his shaft.

"It definitely is a good amount for most," Izuku noted, panting slightly.

"Fine, no money then, Master," Momo moaned. "Perhaps you can come up with a better bet. Something... Sexual, perhaps?" She engulfed his shaft in her mouth and started bobbing her head, continuing to caress his testicles as she did.

Izuku considered dismissing the idea of a bet, but then again, it was perhaps a good thing to encourage Momo to indulge in these little games. Something that would invite harmony between her somewhat competitive side, no doubt part of Momo before she became a genie, and her desire for sexual submission to him. "...alright, let me think," he moaned as she kept bobbing her head. "...alright, I think I got something..."

Momo simply moaned around his cock to indicate she was listening. Then again, she was always listening for her Master's desires, so that was a given. "...if Ochaco doesn't decide to join us in any capacity, we'll just write it off, decide we're better as friends, and focus on a special night together, just normal, first time couple's sex..." he got out, blushing at his own words, but continuing, "If she does join us, then when we have sex for the first time, I will wish for the suspension of all my inhibitions, save the restriction that things happen between consensual adults, for the duration. Even if Ochaco is included." Momo immediately hummed around his cock. "Is that a yes?" Izuku grunted, coming close.

"Mmmmhmmm!" Momo moaned in muffled affirmative, before once again gulping rapidly to ingest her Master's seed, and once again feeling the fulfillment of having pleased him.