Damn dionysus could throw a party.

It was a celebration of a bunch of recent successful quests and of course there was alcohol. And you of course got black out drunk.

You wake up with a massive hangover and your eyes take a second to adjust, that's when you realise it. The bedsheets aren't yours.

You look over and to your horror, is Annabeth. And the only thing covering her is the bed sheets. Meaning you and your best friend had done the deed.