Basically they punished Hodaka by giving him the medicine while he was unconscious. The face he makes when he sees himself becoming a woman is priceless.
If attempted SA is triggering for you, skip this chapter.
Hodaka is crazy. Like he wants stuff to be unbreakable, and does all crazy stuff to things and her past girlfriends to find something unbreakable (by slowly breaking them). Hodaka like Shion because he's a guy and he finds girls to be fragile.
He has the medicine that turned Shion into a girl, and he plans on slowly doing nasty stuff to Shion in order for Shion to love him, even offering the medicine but in exchange, Shion will break up with Rui (which Shion doesn't accept). But he only likes female Shion, so he won't be having sex with the male one, and instead inseminating him in other methods repeatedly in order for Shion to never go back as a man
But in the end, he gets a whack on the head by Rui.
Hodaka is a cray-cray mf.
Hodaka drugged Shion while they were dating (Shion dated Hodaka so he could learn about the girl who made him turn into a girl). At least while being tied, he manage to call Rui for help.
And the chapter also tells us that Rui is the son of a president(?) of a company. It was bought up by Hodaka while he was asking Shion about their relationship, convincing him to be a permanent woman because it will make the relationship open.
Spoiler
She's not seducing Theo, she was checking his horrible wounds that he got when he entered Ume's mind. He was hiding those wounds from Ume.
And I don't understand JP (only use papago) but has the raws, there would be a love confession in strawberry fields. Kinda cute with the flower garland on Theo's head.