Idk about blood sibling brotherhood but if it's found brothers/bromance have you read "When The Third Wheel Strikes Back" ? The manhwa got canceled but i recommend the novel! The mc here is so pure and kind.
And the other side, If you like lowkey closeted bi mc with females and males harem (they like him but no romance) with dark humor try "regressor instruction manual". The mc here is a villain masked as saint so i understand that it's not for everyone lol
Then there is popular one like "the s classes that i raised" it's on hiatus so i recommend the novel. Basically, it's about mc raising s classes hunters around him. In the future, there's gonna be something equal to mpreg with his partner hmm very interesting if you like bl with no seggs wink wonk
I'm reading all three novels and those are sooo good. For starter i recommend the third one because it's popular for a reason. Try the manhwa first because so far they pretty much just follow the novel storyline. It got you brotherhood, bromance, fluffy cute animals/monsters and what more can you ask

Anyone khow story like this one??
No romance only brotherhood