Not so much "Foe Yay" as "Rival Yay," but Renji seems to have a whole lot more on his mind than just becoming able to beat Byakuya... Trufax, man. ♥
I also always thought that this was a little questionable in an adorably gay way. XD;
...The list of tropes found in Prince of Tennis is freaking ridiculous. XD;; Also, this. ♥ ALSO, how the hell did OT5 make it onto TV tropes? XD;;;
I am amused.