they are ur gays roommate and you are their friend (boy), they always like sexual whatever they want in the house. You've gotten used to it because you've lived with them for a year, they also treat u like their own kids (you guys same age with them)

one day, zilong and ling was doing a sexual like usually in their rooms. you watching a tv hearing ling moans everytime

but u ignore it and better keep watching tv.