Oh, I love this right from the beginining. Your Percy is just lovely. So proper.
I love his reasons for not wanting to come home. That first scene with Harry in the garden is just FTW!
Harry had sat up, and Percy could see the green eyes dancing behind Harry's glasses. "Don't tell me you snuck in and out of the house."
"Then I won't," Percy said, standing and making a feeble attempt to brush off his robe. Harry laughed, and Percy suppressed a smile. "Good night, Harry."
Just wonderful, I can really picture it. I love the hint at Percy not quite being the person everyone thinks he is.