Take them somewhere a little more private first.

"Alright, let's head over somewhere a little less occupied," Izuku whispered to them both, and they nodded. After exchanging a few more congratulations and comments of a good game with the other players, they headed off along the beach, leaking for a more secluded stretch of it.

As they walked, Izuku rested his hands on their asses, smiling at how natural sensual contact was starting to come to him. Ochaco and Momo moaned and smiled at him, clearly appreciating it too. "Wow... You're pretty assertive, aren't you?" Ochaco grinned. "I think I like it."

"You can thank me for that," Momo grinned mischievously. "He treated me like fragile glass initially. It took some work, getting him out of his shell to this degree. He's still a work in progress though, but he's come a long way in terms of understanding that respect and taking welcome liberties with willing subjects like us are perfectly compatible concepts."

"Wow, I bet you were a little frustrated at that," Ochaco remarked.

"Not really. Teasing him and getting him out of his shell at his own pace has its own charm..."

"I'm right here, you know," Izuku told them flatly.

"We know~!" Momo laughed, Ochaco joining in, and he grinned ruefully.

"...you two will be the death of me..." Izuku sighed fondly.

"But what a way to go, eh?" Momo quipped as they reached an edge of the beach behind a large boulder. "Doubt anyone will come by here..." she noted.

"Still a little risky though," Ochaco mused, looking around.

"And? That's part of the thrill!" Momo grinned. "Besides, we can easily avoid consequences with my magic if we do get caught... So then, Master, what will your prize be?" she asked with a seductive purr, tracing his chest with her fingertips.