I remember reading one yaoi manga where the uke is detective and he suddenly got horny after witnessing dead body so his detective coulleauge "helped him" to get off .
Also later his coulleauge find out that he become detective to find out his firend killer .
Anyone remembers the title ?

I've read this but can't see to find it. I've been searching well over two hours. I'll let you know if I ever find it.
Edit: found a similar story Knife (Chiba Ryouko).
The one I'm thinking of was kinda older and more depressing.
Edit 2: the one I was thinking of is limiter.

Yes knife .. thank you so much 😍..