He sacrificed his summer vacation for one night.
If he abstained for one night he could have been doing it for the whole summer vacation
But well, who knows how devastated she would be if he refused her and look how happy she is now. So....
Worth it.
Though he is a fucking dumbass for wanking instead of studying, maybe he could have barely passed if he actually went pulled an all nighter actually hitting the books instead of his wang