He's more assertive in pursuit of mutual pleasure.

Izuku felt Momo's magic affect him, the sensation quite pleasant. "Ah," he sighed, before looking at Momo and Ochaco with a fresh perspective. These were two girls, seeking to please him, to cater to his needs... Why shouldn't he let them, given how much they enjoyed it as well? If the satisfaction of him dominating them and them being dominated was fully mutual, then he ought to oblige them.

He proceeded to sit on the grass, parting his legs so his manhood, quickly growing hard, was exposed to their view, feeling absolutely no shame in the exposure. Both girls immediately fixated on it, Momo conspicuously licking her lips. "Both of you sluts, come crawl over to me," Izuku said firmly, mildly surprising himself with how easily he called them sluts, but both immediately appreciated the dirty talk.

"Yes, Master!" Momo agreed, immediately getting on her hands and knees, leisurely moving towards Izuku, Ochaco not even hesitating to follow suit.

"Okay, um... Should I just call you Izuku, or would you like me to call you Master as well?" Ochaco asked hopefully as she crawled alongside Momo.

"Call me Master when we're engaging in sexual matters," Izuku said firmly, but with a gentle smile as they reached him, and gazed lovingly upon him.

"Yes, Master!" Ochaco replied in a bubbly tone, a happy smile on her face.

"What's your next order, our Master?" Momo purred, gazing up at him with Ochaco. Izuku gazed down at them both, seeing eager smiles, waiting for his next command so they could follow it.