Ochaco explores Izuku and makes a few improvements

"You can give yourself legs, right?" Ochaco asked.

"I can give myself anything you want, Mistress," the genie replied, giving a playful, suggestive grin.

"Putting a pin in that...give yourself legs and get on the bed with me."

Izuku's tail split into two. As one tip stepped onto the bedspread it solidified into a blue leg. The other tail followed suit. He stooped down onto his knees and got as close as he could to his mistress. His huge cock pressed into her belly. His head leaned forward, face inches from hers.

"Kiss me." He obeyed. Their lips touched. Ochaco pressed into them harder. She scooched closer and their bodies pressed and rubbed into each other. She could feel his warm tip rubbing against the underside of her boobs. "Tongue," she panted. Izuku opened his mouth and wrestled his tongue against hers. Being a sex genie his tongue was more experienced than hers, but he allowed her to take control, to lap and wrestle with his blue muscle. Still, he would "teach" her a little bit, playfully moving his tongue side to side to make her chase it and adapt.

Her hands found his barely developed pecs, traveled down his waist, and finally to his little genie butt. She squeezed and furrowed her brow. Now fully understanding what she wanted, she had an improvement to request. She hesitantly pulled away. "Bigger."

Izuku took the parting from their kiss to kiss her jaw and nibble at her neck. "What's bigger, Mistress?"

"Your butt. Make it bigger. Not too much; just enough to fill my hands," she explained between moans at his ministrations.

Those soft blue cheeks inflated in her grasp, though didn't lose any of their squish or texture. She felt her fingers stretch out as her hands were filled with them, just as she directed. She thanked his compliance by cupping those cheeks in a better hold, pressing all of him against her more.

"I like that you're giving me so many orders, Mistress," Izuku whispered to her. "It's really thrilling."

"You actually get off on it? Ugh..." Ochaco asked.

"Oh yes." He nibbled her neck. "If we wanted to, genies could go to a mortal world and be worshipped as gods. So being made to obey, to bend our phenomenal power to the service of others - it's so hot, Mistress. All my power, my body, my very form completely at your mercy~..."

Ochaco giggled. "I thought you said you became a sex genie to provide pleasure to those who really need it and give stressed heroes some debauchery to let go."

The genie blushed as Ochaco continued to manhandle his now bubble butt. "I-It can be both. I got into the academy to give pleasure, as I said. During my training I learned how hot submission to my master or mistress would be."

He looked up at her with obvious lust burning in his eyes. "You could say I've been fantasizing about this moment for centuries."

Ochaco's cheeks went red. Practically her whole face went red. Despite now having a full understanding and acceptance of her desires she couldn't help but have a little embarrassment over the progression of things. But she swallowed and steeled her nerves. Her little genie wanted to submit to her. So she had to be a good mistress and keep herself in command.

She leaned forward and whispered. "And did that fantasy include me fucking you?"

Izuku shuddered and sighed. "Yes, Mistress. Dominating me completely."

"I didn't get to play with your member when you jumped inside me earlier. I wish I had a cock of my own I can make appear and disappear at will. I also wish it was just a little bit longer and thicker than yours. Nothing too crazy," she instructed, spreading his cheeks as she thought about invading between them.

"Yes Mistress." He snapped. Ochaco moaned as she pushed away from Izuku. Her own cock grew out from her clit, swelling and growing to a 10-inch, flesh-covered rod. A pair of balls as big as ping-pong balls grew out and slapped her lower lips. Not an addition she asked for, but she had no complaints. The very tip had a dull pink glow to it, like her fingers when she used her quirk. Her cock pressed against Izuku's, dwarfing it. From the way his length bucked, he seemed to like being outclassed by her.

"Wow..."

(Leaving this part to vote in chapter comments. Does Ochaco fuck Izuku as his current bubble butt femboy form? Or does she make him take on a female form and get her first feel of pussy?)