Oh, lovely. As other people have noted, the cross-dressing doesn't work so much like a kink/fetish as much it does an organic part of the character development and plot--and what a sexy part it is, too! I love the tentative pride Severus feels in his appearance, and it only makes his crushing disappointment at Remus' supposed rejection all the more poignant. Poor thing!
It's nice to see Remus finally grow a backbone and stand up for his own happiness! Also, I adore the fact that Minerva and Ginny approve, even if other people don't.