There should be another manga with Rio in high school and he develops a high school crush with some dude but the dad doesn't want his son to be like that and the whole plot line is Rio building up courage to ask out this dude and persuading his dad that it is okay for him to have a boyfriend.
Nah, I don't think that situation would actually happen. You should read the spin off of Rio's father if you didn't yet (The name is "Fukigen kareshi no Nadamekata" btw). Just saying ╮( ̄▽ ̄)╭
There should be another manga with Rio in high school and he develops a high school crush with some dude but the dad doesn't want his son to be like that and the whole plot line is Rio building up courage to ask out this dude and persuading his dad that it is okay for him to have a boyfriend.