Responses
OMG I'M SURE I'VE READ THIS or if not it was the exact same scene. And it was so unexpected because the mom was so sweet and supportive the whole time. And then she like saw them kissing in a car and eventually accepted them right? I DON'T REMEMBER WHAT IT WASSS
I'm gonna look for it and let you know if I find it
WAIT WAS IT THIS? https://www.mangago.zone/read-manga/heating_up/ I just recently reread it so it might be

all i remember was that there was a part where the mc and his mum were watching tv tgt and it was featuring same sex couples, and the son asked the mum how she felt abt it. she was saying it's fine or wtv, but later when he revealed his relationship with a man she was pissed and was saying how she knew smth was up bc he was like testing her on it before.
idek a single thing abt the manga other than that lmaoo i'm so sorry. i think the mc had a sister?? im not sure. if anyone has any idea pls lmk!
(i originally asked this in the Netsuai Nante Ariemasen! comment section, but since a lot of ppl replied also wanting to know what the manga is, i thought i'd ask more people to help find it lol)