OMG I just love FireFly and to combine this with Harry Potter was just brilliant, I bow down to you :D
Jayne was as amusing as always, his character was the first one I well in love with. Mal was cute with his crush on Harry and so honorable that at the end Severus knew he could trust him not to touch Harry and look after him if anything happened to Severus.
I did wonder when Mal released them from the painting whether he was related to Lucius or Harry/Severus so it was a nice twist to find I was on the right path, though it did nothing to spoil the story. It was a brilliant ride with the characters, each finding new things. I nearly stopped breathing when Harry was hurt but just knew that Severus and Simon would be able to save him.