The top is like a cosmic entity/alien where he changes the reality and pretending to be the bottom's younger brother and the bottom is aware that he's not really his brother and someone pretending to be one.
Is it this? https://www.mangago.me/read-manga/into_the_horizon/
The top is like a cosmic entity/alien where he changes the reality and pretending to be the bottom's younger brother and the bottom is aware that he's not really his brother and someone pretending to be one.