Age gap

16-17 and 30's. Older uke. Seme is nephew? Or just the son of Uke's friend but Uke was around most of the Seme's childhood.

Unknown but the seme basically raised the uke, then made the uke forget about him, and they reunite when the uke is around 20.

16 and 19. Younger seme. Brothers (blood related I think). The uke looks younger. Like way younger.

16? And 18? Around those ages. Seme is a first year and Uke is a third year. Both in high school. They are related. By blood.

Unknown but the seme knew the uke when the uke was a child. Side couple 1 ... also iffy. Side couple 2... Uncle and nephew. So.....

Adult x high schooler. Half siblings? Step siblings? It's confusing. But they are "brothers". Younger uke.

Unknown but I think the uke is at least 18? He looks really young though and huge height difference.