Of Course

"Thank you!" She said with excitement as she flipped open the pages. She then began to write what she dubbed "the harem contract."

"The Harem shall refer to anyone who is in Izuku Mirodiya's harem. The only way to be recognized as a member of the harem is to write in this book "I, (Name) hereby submit myself to Izuku Midoriya's harem." and then kiss Izuku Midoriya." That should keep things under control. Ochako then followed it up with a separate entry saying "I, Ochako Uraraka, hereby submit myself to Izuku Mirodiya's harem." She enjoyed the surprised look on her boyfriend's face when she kissed him without prompting.

The first thing she wrote was how anyone within the harem fell under the same rule she did with no one from U.A. interrupting them (which thankfully the book now knew meant all the previously labeled groups) unless they were a member of the harem. She then smiled as neither entry faded away.

Wait... why stop there?

Izuku was simply sitting patiently yet curiously as she started writing down quite a few things. Before he knew it, she had handed him the book with a slight blush, and a mischievous grin.

"Any member of the Harem will still prioritize anything serious over lustful thoughts unless the note itself commands otherwise."

"All members of the harem find each other attractive, and be willing to engage in sexual activities with each other, although they may still be shy or nervous."

"All members of the harem are into the idea of roleplay. They will happily play the role they are given, although they will still be embarrassed if they would naturally feel that way."

"The breasts of the women in the harem will have the taste of candy. What candy it is random until Izuku gets a taste, then it is locked in. However, commands in the sex note can override and replace this flavor, such as Ochako's breasts tasting like cotton candy. Izuku will start to enjoy the flavor of that candy if he didn't already."

"The vagina(s) of any and all women in the harem will taste like honey."

"No body parts of any women in the harem will be stressed or damaged during intercourse."

"Any member of the harem can easily be hypnotized by Izuku Midoriya, or by a member he has given permission to hypnotize others, via swing any object in front of their eyes, showing a spiral, and/or the eyes of the hypnotist in question while commanding the harem member(s) to focus in on it/them. Commands are set in place by a snap of the hypnotist's fingers, and saying "wake up" will remove the commands."

"Um, Ochako?" Izuku said reading the last one. "You sure?"

"P-p-positive."

"We can cross that out if you're uncomfortable-"

"I have my reasons." Ochako looked away while smiling. "It's not strictly for me, but I'd like to try it sometime..." Izuku shut the book and looked at his girlfriend. "So, do I take it you accept?"

"Yeah." He said, still processing the last command as he thought about how to go about tonight since both of them were in the mood.