Of best friends and boyfriends

"Rin lets out a muffled sound that sounds suspiciously much like a certain swimmer's name. Then he chokes out a hoarse sob and his whole body jerks with it. Sousuke straightens his back at the first sound and suddenly his eyes are much more alert." Basically just a lot of fluff and heavily implied SouMako despite the fact that this is a RinHaru fic.