KlaraT

Hello!! Does anybody now the name of this manga??
The plot was something about a teenager that when he was little he was in a gang as a errand boy kind of treated as a servant, and there was this famous guy around that was beating gangs that beat his gang up.
And it turns out to be a friend's older brother and i think he was later a teacher or something like that and he falls in love with him leaves the gang and start following him around...
I also remember that his mother would bring men home and he wouldn't like to go back.

Does any of this sounds familiar? ╮(￣▽￣)╭

Could somebody tell me from which manga is this picture??? (⊙…⊙ )
http://www.mangago.zone/read-manga/kare_otoko_ni_izumi_o/mf/v02/c008/45/