Let's Dive! (Ereri/ Riren)
Eren has always been into diving ever since him and his dad bonded over it when the Olympics were on one summer, a long time ago. He has been on his school's diving team ever since and, for a while, even trained for the Olympics. After his beloved father dies, however, his mom refuses to keep them in the same house and moves him to a new state, new town and a new school where he meets a new friend who just so happens to be on a diving team with a really intimidating captain.
Disclaimer: I do NOT own SNK/AOT or any of the characters. The only thing that is mine is the plot. I also don't own any songs mentioned or shown or cover art. BoyxBoy don't like don't read (why do I even need to put that on there, that should be common sense). Ereri yaoi.