Not sure if it's shounen ai or yaoi but the story goes like he's into a guy (of course hehe) he met his family in the near end chapter and they want him to withdraw a file against their son( which is not their biological but they don't know) then he cried and his partner is somewhat related to his family I guess and he ask them if they're being serious as to what they're doing. The mc is crying as he saw the people who suppose to be related to him protecting someone else, he's devastated and willing to accept it as there is an Oldman in the bed begging him to accept the arrangement .........I don't know if I remember it correctly but I guess some point was stated hehe
I just remember some scenes like they're in a class and the teacher was asking how to kill goblin or some other type of monster and the mc's answer has angered the teacher and she/he tried or let the mc battle the monster and he did killed it the way he answer like punch it ( the monster's had a hard skin so it can't be killed like a single punch) but he proved his answers are right mulple times, every question he demonstrate it killing diff monsters with easy and basic attacks just like how the answer he was written by.
https://www.mangago.zone/read-manga/the_constellations_are_my_disciples/ I think it's this?
Mori is too adorable, whatever he do he's just so cute. Rider is handsome too. I can't get enough of this want moree pls update more, I'm so invested in them