Lonely Hearts Club by biscuitsandgravy
Sousuke discovers that he's fallen hard for his childhood friend and roommate, Rin. He's not sure how to approach the situation, but with the help of Ai, things may work out for the best. There's just one problem: Rin is in love with Haru.
I am really enjoying this story! The author captures the characters' personalities and emotions superbly and makes me like each of them even more. Although the story is primarily centered on Sousuke and Rin, Ai steals the show in my opinion. If you were on the fence about the little grey-haired swimmer, this story will certainly make you a fan! Highly recommended!