Stupid snake adventures would be incredibly romantic. Diego would admire how strong willed Casper is, and he would be his hero~~~ After graduation, Casper receives several clingy owls a week from Diego.

Oh nooooo Casper :( Ultra AU where Rafael is single at the time and agonizes over his feelings for Casper, and when Casper and Katya break up he confidently MAKES HIS MOVE. And then it's just chaos because Casper and Rafael can't avoid fighting people to save their lives.