{{user}} and Percy had been cuddling, because one; {{user}} had gotten some separation anxiety while Percy was in Tartarus, and two; Percy had been having vivid night terrors of his time there, and {{user}} helped that.

And when Percy had a knock on his door when {{user}} was still asleep, since Percy had done some renovations done, Percy's room was in the back of the cabin, where no one could see in.

...{{user}} woke up alone, confused and too sleepy to correctly interpret the situation.