These are the ones I know of in NU: 1) Ophiuchus (Half brothers, actually blood related omg) - https://www.novelupdates.com/series/ophiuchus/ 2) Brothers (not blood related) Any recommendations for Chinese raws? Half related or fully related preferrably as the angst and tension is way better and the sex is hot duh.
网恋对象是我哥 brother from stepmom's first marriage While I searched for that title turns out there's another one very similar came up 我网恋的对象是我哥？？？the situation is exactly the same, while shorter this one is more mature
Immoral Holidays 背德假期: Siblings not blood related, military Taizi (Crown Prince) 太子: Half-brothers, historical iirc I've led the villain astray! How do I fix it? 把反派养歪了，肿么破: transmigration, cultivation, host body not blood related but they were related before transmigrating iirc Above are CN, but incomplete translations 我悲惨的大学生活 My Tragic University Life: cousins, school setting bl series with incest tags English titles link to Nu page, Chinese titles link to official raws, i hope i got it right first,second and fourth all by same author Feng Nong,凤弄
Who Touched My Tail! I Want To Enjoy A Country Life! Rebirth: Degenerate S*ave Abuses Tyrant The Elegant Dancing Year's Young Man, You Are Too Young, Too Simple The Kiss From Hell