From behind.

"Let's pick a spot where we can both enjoy that little show," Izuku asserted, gesturing to where Momo and Ochaco continued to writhe on the floor of the locker room, driving themselves and each other crazy with pleasure.

"Of course Master, where specifically?" Yumi asked, still smiling softly.

"...bend over with your hands on that bench," Izuku ordered, gesturing to said bench.

"As you wish, Master," Yumi breathed, walking to said bench, and bending over it in a way that presented her tight, firm ass to Izuku, and gave her a clear view of her fellow slaves. "...like this, Master?" she asked, looking back towards him for guidance as she gave her rear a shake at some internal prompting from Yuya.

"Perfect," Izuku smiled, walking up to approach her, his eyes swapping focus from her ass to Momo and Ochaco, who were both in the throes of orgasm, but unable to stop themselves from continuing to and recieve pleasure to each other. In the face of his orders, they were completely helpless to rest, and honestly, they were clearly enjoying themselves so much that the only reason they would stop if they could was to catch their breaths. He placed a hand on Yumi's backside, caressing it gently, admiring the firm, but still soft texture. Momo had indeed crafted a masterpiece.

"Oh..." Yumi moaned as she felt her Master's touch. The sensations were unfamiliar, but very welcome. Izuku proceeded to unzip his pants, extracting his erection, and placing it at her entrance, before sliding it right into her folds. "Unh!" she gasped, siezing up and gripping the bench, not sure how to handle the sheer sensation coursing through her. She grit her teeth as he buried himself to the root.

"Wow... your vaginal muscles have a lot of strength to them too..." Izuku groaned, feeling Yumi's pussy clamping down on his cock almost like a vice. He placed both hands on her ass, and began to move slowly, giving her time to get used to the new sensations.

Yumi panted, losing her new self to the sensations for the moment. Before, she was confused to suddenly be brought into existence, but now, she knew she wouldn't trade this for anything. She hoped her Master would find plenty more opportunities to use her, train her, fuck her!

Izuku gave her ass cheeks a squeeze as he sped up a bit, moaning as he and Yumi continued to enjoy each other's bodies, occasionally also glancing at Momo and Ochaco. It was hard to tell who was giving the other more pleasure, Ochaco's tongue was enhanced, but Momo had more skill due to being a sex genie. Though Ochaco made a good case by sucking the tiny nub of Momo's clitoris into her mouth, and brushing her tongue rapidly over it, making both herself and Momo sieze up in rapture.

Before long, Izuku lost all control of his own desires, pounding himself into Yumi as hard and fast as he could manage, making her continue to gasp and cry out, her grip tightening on the bench, making it splinter in her grasp. His cock began to pulsate within her, and he tightened his grip on her ass. "Yumi... I'm about to fill you with my seed..." he panted.

"Please, Master, do it!" she cried out happily, and Izuku obliged, filling her up as his cock erupted, filling her with his essence, and pushing her over the edge too. "AAAAAAAAHHHHH!" she cried out, her eyes rooling up and her tongue lolling out in a classic Ahego face. She collapsed as Izuku slowly pulled out of her. He glanced over at Ochaco and Momo again, still completely lost in their lesbian frenzy.

"Okay, give each other one more orgasm, and you two can stop," he ordered. They didn't consciously acknowledge the order, so lost they were in pleasure, but their **** minds did, and when they screamed out a final time, they both collapsed, their faces exactly like Yumi's as they gasped for breath. He approached them. "Did you both enjoy that?" he asked them with a smile, already knowing the answer, but neither responded. "...girls?" he asked, but they were completely dead to the world at the moment, completely lost in a heavy haze of post orgasmic bliss. "...I think I broke them..." he chuckled nervously.