That’s rape but okay
The uke never consented to being watched by a third party. Imagine this: Your lover proposes sex with a blindfold, you agree because you trust them enough to do so. Then in the middle of sex, you hear a voice, an unfamiliar voice complimenting you and saying they want to screw you (since you're just their type). It's the voice of a gender you feel no attraction to (whatever that may be).
Some people may be okay with this but the uke was not. He was scared but didn't want to let the seme down. He knew that if he denied the seme then he would not be happy/satisfied. Basically, he felt pressured to consent to the third party. Even though he is 1) not interested in women and 2) didn't feel comfortable with anyone else there.
Spoiler:
A situation similar to this happens in the future and the uke hard rejects it (pissing the seme off). By then the other love interest has already come into the picture and his feelings for the seme have faded which is why he doesn't care to listen to him anymore—denying sex with the two men he was being forced to have sex with while the seme watches. Plus, instead of comforting the uke who was scared and crying, the seme treats him very very harshly.
SPOILER
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I’m not sure on their names but read the raws black haired guy does drink blonde haired guys blood while the abuser goes and reveals himself to the bottom and then after blonde has finished with black hair guy he shows him the abusive guy and bottom together and black hair guy gets all mad
Pls I’ve never struggled harder trying to remember who you’re talking about by hair color
I’ll try and read a few chapters yo help out hang on
Oh god I can’t do this our baby uke is too sensitive and we know how he is going to react . HES GOING BACK WITH THAT TOXIC BITCH WHORE AHHH well I hope not ugh I know how badly he is going to get hurt
In the chapter blonde showed black haired vamp the uke and his abuser through some sort of mirror so I’m not sure if it was two ways or one but the uke was crying I guess we’ll know in chapter 50