I don't read incest so I'm not sure if this is any good but
Souta and his big brother
thank youu ill check it out
https://www.mangago.me/read-manga/a_relationship_that_should_never_be/
they are not biologically related though this one only i tolerate lol
Spilled blood (they're not blood related)
tysmmm(づ￣ ³￣)づ
tytyyy gonna look into it rn
( ◜‿◝ )♡
brother x brother