I'm looking for some yaoi where the seme waits for the uke to be old enough to have sex le...

http://www.mangago.me/read-manga/irony_dress_ni_sayonara/

there was this couple where the seme make sure the uke stay alive after the uke has an accident at young age. seme take care of uke until uke has grown up. the seme can transform into a bird and has no reflection in the mirror

http://www.mangago.me/read-manga/akuma_wa_hohoemu/

thank everyone! (づ￣ ³￣)づ

http://www.mangago.me/read-manga/sayonara_alpha/

I can't remember if he waits until it's legal, but he's much older than what's depicted in the cover illustration.