a more permanent change

"Alright, Momo, let me inside." Deku ordered

"Of course, master." Momo droned

Deku decided that he was going to try something else with Momo. And if he got bored of it he could always do a full rewrite like Ochako and Mina. He started by dropping his pants to to reveal he erect penis. "Okay, Momo, first things first, since you're so interested in measurements, you're going to get a good feel for mine. Feel my penis and commit its shape, ridges, size, and girth to memory."

"Of course, master." Momo walked up to Deku and methodically ran her hands all over his his junk, subconsciously making mental notes of every inch. When she had the full image she pulled back and returned to her original position. "Measurements and textures memorized, master."

But, Deku wanted to go one step forward. "Not quite yet, you've got the feeling in your hand down, but we both know you like to be more thorough. So, I'm going to stick it in your mouth, pussy, and ass so you can get the full picture."

"Of course, master."

Deku put his hand on her head and dropped Momo to her knees. "I'm going to stick it in as deep as it will go for all three, give me a thumbs up once you think you have the feeling down." Deku proceeded to plunge his shaft as far down Momo's throat as possible, but first he moved in around her tongue and cheeks around the way. Momo gagged a bit, but after a few seconds he got the thumbs up. As he pulled out he told her "Okay momo, drop your panties and lift up you nightgown and lay at the end of your bed."

"Of course, master." Momo proceeded to drop her lacy, black panties to the ground and pulled up her nightie to reveal her meticulously trimmed snatch, which she proceeded to splay out on the end of her bed.

Deku approached her "Same idea as last time, but this time, when you get the feel, say, 'Dick Savored'" Deku then slid his way through her tight pussy lips and slowly slid his way to the back, making a few pumps along the way.

Momo moaned lightly and began to blush "D-dick savored, master."

Deku then flipped Momo over so her ass was presenting to him. He pulled apart her ass cheeks and followed suit.

After another few seconds "Dick savored, master."

After a lot of build up, Deku could finally put his plan in place. "Good, now, Momo, when you come out of the trance you'll forget how you got these measurements, but they'll become a part of you and you'll never forget them. Subconsciously what you just measured and felt is your ideal dick."

"Of course, Master."

Now it was finally time for Deku to make his move. Instead of a full change, he would have fun giving Momo a bunch of triggers that could be activated by certain phrases. "So let's really get things started, Momo, from now on, when you hear the word Sex you'll reflectively create a dildo with the exact feeling a measurements as your ideal dick, no matter where you are or what you're doing. You'll feel compelled to pleasure yourself with it, but not at the expense of doing something important, in that case you'll find a place to put it and go back to it later. But if what you're doing isn't urgent, you'll find yourself trying to excuse yourself to go someplace private to work you vagina, asshole, and mouth."

"Of course, Master."

"Good, next if you hear the phrase Stress Relief, you'll groping your tits without realizing it and you won't realize your doing it or be able stop until someone points it out to you."

"Of course, Master."

"Next up, If I'm talking to you and say "Blank on..." followed by something like your name or goals or whatever, you'll immediately forget all about what I mentioned and accept the next thing I tell you as always having always been true, no matter how ridiculous. And you won't ever realize I said blank on to you once you forget."

"Of course, Master."

"On a similar note if I say "Forget yourself" you'll immediately forget what your were doing and whatever I tell you you were going to do, you will, and rationalize it in your head. Like with Stress Relief, you won't realize it's embarrassing unless someone else points it out to you."

"Of course, Master."

"If you here someone say "Plus Ultra" you'll imagine yourself in some kind of sexual situation with me, but if you her the phrase "Girls Rule" you'll imagine yourself in a sexual situation with one of our female classmates."

"Of course, Master."

"Now, Momo, I want you put your panties back on, but take your nightgown off. You've always slept in just your underwear unless your were at a sleepover. But even then, you wished you could strip down. Also when you wake up, you won't question why I'm in your room. You'll believe you invited me in."

"Of course, Master." Momo lifted off he black nightie to reveal her equally lacy, black bra and ample bosoms. She the picked up her discarded panties and slid them back up her legs.

With that done, Deku was proud of the triggers he'd put in. And if he wanted more, he could always add them. But there was one other thing he needed from Momo...

"Momo. When you wake up you'll be fully aware that I want a harem of sexy girls under my control. You'll fully accept that you are one of those girls, and you'll want to do anything in your power to help me grow my harem. I'll be giving you a list of girls who I think may be difficult to get to, and you will be responsible for coming up with a plan to help me get them. You'll also be coming up with fun harem events, and fun triggers and programming that I can give the girls." He said

With this programming in her, he quickly jotted down the names of the girls he thought may be difficult to control.

Kyoka Jiro, Midnight, Nejire Hado, Mitsuki Bakugo, Mika Jiro, Fuyumi Todoroki, Mt. Lady, Bubble Girl, Ms. Joke

He also wrote down the girls he thought would be easier, but still wanted to let her know just in case

Tsuyu Asui, Toru Hagakure, Itsuka Kendo, Mei Hatsume

With this settled, he...