What the Hell Happened to Sousuke? by tornadoquakes
Three years ago Sousuke disappeared from everyone's lives without explanation. His departure was particularly hard on Rin since he couldn't understand why his best friend would abandon him like that after all the plans they'd made. When Makoto literally bumps into Sousuke one day while on his way home, he takes one look at his former acquaintance and decides he is going to help him.
I am blown away by this story! It is so well-written and all of the emotions expressed by the characters are palpable. This is definitely a SouRin story, but MakoHaru is also heavily featured. You will swoon reading about their intensely sweet, domestic relationship. I highly recommend this gorgeous story for any fan of Free!