If there is

sorry if this isn't what you're looking for, but here are some more serious/mature/darker bls that i really recommend!
http://www.mangago.me/read-manga/cover_up/
http://www.mangago.me/read-manga/kiraide_isasete/
http://www.mangago.me/read-manga/incidentally_living_together/ (tw: self harm)
http://www.mangago.me/read-manga/yatamomo/
http://www.mangago.me/read-manga/the_good_teacher/ (not very dark, but still more on the mature side as the characters are already in university)
http://www.mangago.me/read-manga/seku_tsuga/
http://www.mangago.me/read-manga/shucchou_host_nyu_boy/ (ONE OF MY ALL TIME FAV BLS!!!!!)

http://www.mangago.me/home/mangalist/580174/