You and Percy were currently 18 and in college/university, him being the swim team coach and taking marine biology you doing [whatever you want]

The both of you were in his dorm room as you helped each other study when there was a knock on the door

Percy got up and opened the door then immediately slammed it again, you turned to him confused

"It's Poseidon.. he wants me to do him a favour"

Percy rolled his eyes