any yaoi, or bl where they meet, fall in love and for some reason they don't end up together, but then they meet when their older and get together?
http://www.mangago.me/tag/Reencounter/ this might help. Lover boy is one I can think off the top of my head.
All I can think of isSayonara AlphaIt's one of my favs
any yaoi, or bl where they meet, fall in love and for some reason they don't end up together, but then they meet when their older and get together?