Any ideas? I'll be grateful for all the recommendations.

umm ok so suicidal and self harmer goes along together
but how does rent boy related to that?

so you want to read a story about a suicidal rent boy??
or are you saying that rent boys are suicidal??

there are "prostitutes" category and "suicide" categroy, just combine it with yaoi and you'll get a lot of answers

http://www.mangaupdates.com/series.html?category=prostitute%252Fs& genre=Yaoi&perpage=50
http://www.mangaupdates.com/series.html?category=suicide& genre=Yaoi&perpage=50

Well, there are lots of self harming people who actually don't want to kill themselves so I think it's a different category.
Oh, I've meant yaoi with suicidal or self harming uke OR yaoi with a rent boy uke, not a story about a suicidal rent boy. Sorry, I should have made myself more clear.
Thank you for the links, I'll check them out.

Kare no Niwa ni Saku Hana - 7) Bird On The 12th Floor
Hohoemi no Nichijou - 1) Hinata (Sunny Place)
Running on Empty
The End of Youth - a little, there are only suicidal thoughts if I remember it correctly
Ai ga Areba Toshinosa Nante - 4) From Rain
Netsujou Innocence
and Cut of course

________________
I have the simplest tastes. I am always satisfied with the best.
- Oscar Wilde -

Thanks a lot, Triski!