At first I thought this was gonna be a dad x son bl, I'm glad it went another way (๑•�...

I thought the same thing. I already felt like the uke was going to be involved with someone way younger than him, but when he said he had a teenage son, I worried that he never met that son and that they would somehow end up romantically involved. And then they would find out they're actually related. That would have been fucked up (but I'm glad it didn't happen like that).

My second thought was that the seme would be his son's friend or classmate. I'm glad this story went down the second route. The first one would be some psychological type of shit.