Start getting her settled.

"Hey there," Izuku said gently to the new being before him. "Do you know your name?"

Yumi blinked, taking a moment to consider it, as if trying to recall her own name. She was clearly disoriented from having suddenly gained sentience. "I'm... Yumi, right?" she asked, processing her new thoughts and feelings slowly. "I'm... A bioweapon? A sex ****?"

"You are more than either of those now, though they definitely are part of who you are," Momo smiled, getting Yumi to her feet.

"...I was created to kill, yet repurposed?" Yumi inquired, gazing back and forth between Momo and Izuku. "...what are these voices in my head?" she then murmured, placing a hand on it.

Izuku shivered a bit at the reminder of Yumi's original purpose. "Those are other, more complete personalities. You're still in the process of deciding who you are overall though. We left that entirely up to you. The other selves are just sides we can bring out at will. But right now, how are you feeling?"

Yumi stared at Izuku, her expression unreadable. "I feel... Good actually," she noted. "Like I'm ready to understand the world, understand myself." A faint smile came onto her face. "And most of all, I'm ready to serve. I always was, but now, I actually feel like I can feel something about it... Joy, I think?"

Momo giggled a bit as Yumi continued to process the surroundings and thoughts she had come into the world having. She hadn't changed the wiring in her brain that made her obedient to Izuku, just made sure it was connected to the reactivated pleasure centers. Now she'd get a nice hit of dopamine and serotonin every time she received an order and followed through. And she'd also taken the liberty of crippling her brain's ability to build up a resistance to those hormones, so she'd never get diminishing returns of pleasure.

"That's good to hear," Izuku said, gazing at Yumi intently as she tentatively approached him. He had to tilt his head a bit, even though she was smaller than she was before Momo changed her body, she was still about half a head taller than him.

Her soft smile didn't diminish. "...the one calling herself Yuya is telling me to hurry up and start serving you... May I?" she asked, a faint blush on her face, but not looking away from him.