Responses
Um, not exactly what you described but similar
https://www.mangago.zone/read-manga/mayonaka_no_acchimono/
Ohh looks pretty cool thank you so much (≧◡≦)
It’s from the 2000s . Bl manga with being with wings that resemble an angle and a devil, they gain power during the day and night, depending on the person and turn into their adult form when they are in the height of their power. They turn into their chibi form when it turns into night or day and one of them losses power depending on the time of day. It’s also a comedy. It’s been so long I have no clue beyond that. Oh ya one of them has light hairand the other had dark hair