Momo Yaoyorozu

"JIRO!" The voice said again. "I knew it!"

Deku started to turn around, but felt herself grabbed and something cold strike her wrist while a hand grabbed the other. She could have resisted, probably, given the strength of the other person, but was off guard and quickly found her hands handcuffed behind her back.

She was pulled away from Jiro, and tried not to send her tumbling from the sudden movement, and spun around, just in time to see Momo clipping another cuff to a pipe. "I knew this was a bad idea!"

Her efforts to keep Jiro balanced failed, though she did manage to catch herself and just ended up on her hands and knees.

"W-wait...I..."

Momo ignored her protests, shoving past her to Jiro. "Jiro, are you ok?! Why did you hang up?"

Jiro looked up at Momo, clearly somewhat dazed, and grinned...then straightened up, turned and kissed Momo deeply.

Momo was unresisting, for a moment, then her eyes widened and she pushed herself away from Jiro. "J-Jiro what are you..."

Jiro embraced her again and kissed her. Deku caught a glimpse of her cock, which seemed larger than anyone else's she'd encountered so far besides her own...about 8.5 inches, at a guess. But then it disappeared between the two girls as Jiro began to grind against Momo. "Jiro, stop!"

Jiro did pause at that. The quirk made her horny, not completely fuck-crazy. "I..come on...you'll love it."

"No! She did something to you!"

"Noo it just...feels so good. So horny..."

Deku had a flash of insight, and pulled back her quirk from Jiro before things had a chance to escalate further, replacing it with Earphone Jack.

Jiro's expression cleared up rapidly, though her nipples, although smaller, still stood up prominently. She stepped back and Deku could see how wet she was.

"I...I'm sorry." Jiro blushed intensely. "I didn't mean to...It was just..."

"It's not your fault! It's hers, but this is why you shouldn't have hung up! I could've been here sooner!"

"N-no. I...I asked for this."

"What?! Why?" Momo blanched.

"I...It's...I couldn't pass up a chance like this...but I didn't want you to know yet...I'm sorry...I didn't think you'd panic, I should have thought it through more..."

"Y-you...I...Wha..." Momo was clearly baffled.

"I...I've though about this kind of thing for years...and I...I'm into you."

It was then when Deku felt the sudden sensation of Jiro regaining Harem...without Deku's input, and Earphone Jack fading on it's own.

Her cock sprang back into existence and her boobs ballooned out again.

Momo turned to shoot a glare at Deku. "T-this isn't the time!"

"I didn't do that!" She wondered idly if her power had...evolved again.

"I...I think she's right." Jiro chipped in. "I think it was me...but we don't have to...I'm sorry. Lets just go. Please. Let Midoriya loose and lets go."

"B-but..."

Jiro closed her eyes and her new assets faded. The two quirks switch back to normal again. "Please."

Momo sighed. "Okay...I'm sorry." She pulled a small key out of the skin on the back of her hand and walked over behind Deku and unlocked one cuff of the custom three-cuff shackles. Then she handed her the key. "I..."

"It's fine. I get it...and I'm sorry to have scared you...both of you."

Jiro started redressing in silence, and then walked past, turning toward Deku as she did. "I'm sorry this went so...weird. But thank you...We'll...talk later ok?"

Deku nodded, and both girls slipped out. Meanwhile, Deku was thinking about this new development in her quirk_.- - - - - -

_

"Yep. As far as I can tell, three things have changed when you claimed another person. For one, unless you specifically lock them out, anyone in your little Harem can trade their own quirk for the weaker version of yours at will." Tomoko exposited.

"It's not a..."

"Isn't it? Regardless, you should be able to will them to be locked, and They still can't take other quirks without taking yours first. They should also be able to sense each other, though I think in less detail than you. Also...You should be able to partially suppress your own quirk now. Basically trading it for a second quirk from your Har..."

"It's not a..."

"Fine fine..." Tomoko laughed. "You know what I mean. Anyway...this is a pretty big development. And you've added Earphone Jack and Vines to your quirks? I'll get started on some new designs..."

Deku heard Tomoko muttering something about nanotech under her breath as she walked away.

Deku spent the rest of that evening and night running...damage control, of a sort. The first thing she did was lock the non-hero members of her group into their quirkless state. It was what they had wanted, and she didn't want them accidentally swapping quirks. After some thinking, She also Locked Bakugo into Explosion, at least until she could work up the nerve for a real conversation with him. And then she locked Shiozaki into Vines, terrified of the idea of the girl on the loose with Harem. The others, she spent a couple hours messaging back and forth, explaining the new situation, including to Jiro...who never responded back, despite the messages being marked read.

Eventually, she figured out why, when, among the other experimentations she felt her various "girlfriends" were clearly trying, she felt Jiro take back a copy of Harem...and then a few minutes later, a new member joined the "Harem" as Creation joined her pool of quirks.

Deku's cock stiffened immediately as she realized what that meant. She jerked off twice before falling asleep.

A/N: Don't worry, Momo and Jiro aren't going to remain offscreened. I just felt they wouldn't jump right into putting on a show for Deku just yet.