WAS IT THIS ONE http://www.mangago.me/read-manga/kodomo_x_otona_no_houteishiki/
OMFG THANK YOU!!! Thank you so much >w< It was that one!!! No wonder why I couldn't remember/find it! It was just one volume and it was like the previous chapters were a prologue! I saw that a couple of days ago as well! Though I do have to admit, that all I could remember then was that I know I read it, but forgot the plot _ _||| Thank you so much for helping me!

Hi, I started re-reading 'Love Kids!!' and remembered this yaoi that was kind of similar as far as I remember, but sadly, I forgot the title or the title of the prequel, I'm pretty sure that there had been a prequel. ┗( T﹏T )┛The manga shared some similarities with 'Love Kids!!' if I do remember right, but with that I mean that one of the protagonist was in love with his dad's partner, whom he has known since he was a kid, which was around the time his 'parents' got together, and in the end he gets together with his childhood friend who I think had feelings for him since he was a kid, at that I'm not too sure.
However, it got differences with 'Love Kids!!'. After he got rejected (I'm not entirely sure if he actually confessed or not, sadly that part is blurry in my mind), he moved to the dorms (I think he chose a school with dormitories) and became a player, which was a huge character change if I remember right. I think he was more innocent before. Please someone tell me the title of this yaoi, please!(/TДT)/