Yeah, it's by the author of that yaoi yakuza X doctor. The doctor looks like a shotacon despite being an adult.
That author also has this yaoi: a virgin fisherman X guy who works in the bar.
I like much more that story you
describe, but sorry I forgot the name.
Author: Honma Akira. Search in the manga with a Tiger on the cover. It's one of the chapters.
Thankyou so muchh!! I tried looking for the name of the story on the tiger manga but it doesn't seem to have a name lol.
The uke becomes a tutor for the seme when the seme is a kid, seme is actually a genius but acts dumb to keep uke tutoring him. seme gets discovered then goes abroad for fast paced advanced studies for geniuses. Reunion at uke's workplace years later, seme has grown up and is handsome and keeps pursuing uke. I also remember some kind of faking experiment where seme acts like he's giving routine vitamins and taking a medical checkup where seme fake pierces uke's ear and gives him sugar pills just to keep in touch. I don't know if this is helpful, but I've been looking for a while and can't seem to find it...I'd appreciate the help!