It's not about who you fuck or who you don't why does it always have to be sexual
Even today LGBT is not completely normalized, and at some point you want to like, not hide stuff from your parents? I think it's pure respect to tell your parents about you, be it you like trains or you like boys or girls, who cares, you don't have to make it sound like you're telling your parents about your BDSM fetish, it's just some casual chat about hey dad I have a boyfriend or hey dad I like boys.
It's not "forcing anything", for goodness sake, with the whole forcing stuff, it's telling your parents about you and getting some reassurance, widening your comfort space a bit. Many LGBT people fear about their identity being discovered by others, and having people know and accept of it or deny them gives them reassurance. If they accept you, you remain with them, if they deny you, you get away from them.
I get what you mean, and for some younger people who live with their parents it could be okay to remain silent to avoid these things if they know their parents won't be approving of it, but in Bubble's case that's not really an issue at all considering the distance.