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Not completely the same, but the part where they exchange people to kill is in point with this one http://www.mangago.zone/read-manga/psycho_young_dream/
hOLY SHIT THANKS yeah my fault its not all correct since its been years, I forgot, im most likely mixing more mangas in there LMAOAOAOAO
So there's this manga I read and I can't remember the name, but it was a yaoi/BL was the main character meets someone online (let's say MC for the main character and 'O' for the person online) then I think MC makes a deal with the person the deal was: MC had to kill someone for 'O' in exchange for the 'O' to do the same. I don't really remember what happens after, I don't remember if MC falls in love with 'O' then 'O' says he loves him back but then abuses him and kidnaps him or if 'O'just started abusing him and kidnapped him, I also remember they met in their childhood, anyways the point is that 'O' is a Pshyco, who abuses MC when MC escapes I think 'O' dies because MC killed him? I'm not sure lmao it's been so long, the point is MC wakes up in a hospital, I'm not sure if in a normal or mental hospital, but 'O' comes in the room and is sorta nice to him, and then he finds out 'O' is his brother and not the Pshyco person he made up in his mind. I'm not sure at this point since its been way too long but it was a very good story ╮(￣▽￣)╭