From September Sanlations:

Pairings: Shigino Kisumi x Yamazaki Sousuke; one-sided Yamazaki Sousuke x Matsuoka Rin

[set around episode 8 of Free! ES] Kisumi drops by Samezuka to say hello to old friends Sousuke and Rin–and decides to lend a “helping hand” to aid Sousuke in coping with his feelings for his best friend that he can’t bring himself to act on.