Okay him calling him “Dad” MUST be a translation error

adopted son, pretty sure

I don’t have any proof but I just know it’s not I’ve been here too long, I’ve seen too many stories where they call out to their partner like they’re biologically related making the story weird af (usually because of adoption or marrying into a family) and stories where they are legitimately related which is obviously worse.

Good enough for me this the most we can hope for BL plots like these TT