I would like to know this too!
sounds interesting. i would like to know the manga.
actually i read that manga before but forget the title but i remember the author AKIRA NORIKAZU
my guessing the title http://www.mangago.me/read-manga/heart_strings/
yes!!! thank you ε=ε=(ノ≧∇≦)ノ
It's Twin's Labyrinth :)
http://www.mangago.me/read-manga/twins_labyrinth/
there are two uke and seme so one uke and seme will be (A) and the other would be(B).
it's about two twin cousin (both are ukes) and both of their lovers (the semes) run track.And seme A don't know about his lover(uke) has a twin cousin until the uke A got sick and uke B can to his school to find seme A.