I can read these mangas many times! I rate them >9.5/10 based on my own preferences, so there will be lots of non-mainstream BL
Genres: NO PWP, no doujinshi
Length: <100 chapters or 3 vols
Search by tags: http://www.mangago.me/home/people/12706/manga/1/
If you like this list, please click "RECOMMEND". Thank you XD
2nd list: http://www.mangago.me/home/mangalist/655038/
3rd list: https://www.mangago.me/home/mangalist/3746699/
(IF 1ST LIST IS FULL, I'LL MOVE OLDER ONES TO MY LIST 2&3)
Hope you'll find something interesting to read
(P. S english isn't my mother tongue so excuse any mistakes)
Links for Part 2, 3, 4 & 5:
Part 2 : https://www.mangago.me/home/mangalist/1473905/
Part 3 : https://www.mangago.me/home/mangalist/2125130/
Part 4 :
https://www.mangago.me/home/mangalist/2534333/
Part 5 :
https://www.mangago.me/home/mangalist/3700249/
Also if you want plz recommend my lists
Wish all of you the best