They parted as fiends

After Ben and Olivia cleaned up some, they laid on his bed a while, among the smells and bodily fluids, exhausted, like a cumshot at the end of its flight...

Glancing at the school beauty next to him, Ben reflected on their ironic twists and turns, in their relationship, and in bed… Not long ago, she'd struggled against him in class, engaging in a match of wits. Now—she snuggled against him with her ass—engaging with her snatch and tits.

...

On top of all that, was Ben...who also changed. After this experience, he gained some vicissitudes...on his face and mushroom tip…

He sighed. 'In this world, there is no forever enemy nor forever friend…'

He understood the truth of that idiom with perfect accuracy. It meant he could sleep with anyone.

…

As for this special encounter with Olivia, it was momentous in helping him grow as a person and as a man, because he'd gotten the enemies become lovers tag…