Because
You’re the only one who’s normal here
Idk dude ;-;
I mean... he's technically not human so...
Wait until you find out other species that fuck or being fucked in the yaoi world like literally dogs, cats, water deer...you name it bro.
However, comparing to those mangas, manhwas... I would say this manga it's actually completely okay and normal since both of the main characters are not human
Why I am the only one who don't feel good about this guy who is a fucking spiderman... It's so weird...