You’re a Cute Slave of Love
Complete | Jita | 2000 released
Not super great and they aren't blood related but it's one of the first bl manga I've ever read. Special.
Bokura ni Namae wo Tsukerunara
Complete | AGATA Ito | 2019 released
Brocest kinda boring but the sex isnt bad Maybe read again
Tasogare Outfocus