Kat here! Feel free to remix any of my bonus round fills. Would appreciate it if you could link back to my work, and send me a link to yours as well.
BR3: Fan Soundtracks
(Chihayafuru) Sudo/Chihaya: slow burn, mind games
(Daiya no Ace) Jun/Ryousuke: road trips, sunsets, regrets
(Prince of Tennis) Inui/Eiji: reunion, arrivals/departures, open endings
(Yowamushi Pedal) Arakita/Onoda: "you're so scary, i'm afraid you'll eat me!"
(Yowamushi Pedal) Midousuji/Onoda: you and me against the world, everything was yellow and perfect
(Daiya no Ace) Jun/Ryousuke: "I solemnly swear that I am up to no good."
(Prince of Tennis) Inui/Eiji: "The best kiss is the one that has been exchanged a thousand times between the eyes before it reaches the lips."
(Yuri!!! On Ice) Chris/Yuri or Chris/Yuuri or Chris/Celestino: "You mustn't be afraid to dream a little bigger, darling."
(DAYS) Kimishita/Tsukushi: Tsukamoto in Kimishita-senpai's bedroom with a matching pair of polka-dotted boxers
(DAYS) Kimishita/Tsukushi or Kazama/Tsukushi: Tsukamoto in the washroom (or on the field) with his inverted jersey
(DAYS) Mizuki/Tsukushi: Tsukamoto in the hotel lobby with a soccer ball
(Haikyuu!!) Tsukishima/Hinata: Hinata in the gym or club room with a handmade MVP medal
(Prince of Tennis) Inui/Eiji: Fuji in the club room with his camera
(Daiya no Ace, Chihayafuru) Furuya &/ Chihaya: Chihaya in the park with an actual "stamina roll" (spoiler: it's a cake)
(Daiya no Ace) Chris/Sawamura, G, 1000+ words: omamori
(Daiya no Ace) Furuya/Sawamura, M, 400+ words: the way we are