I liked this a lot, though I fear the warnings will put off folks who needn't be--it's dubious and it's bondage and it's young, but it's not especially dark, except in that it's manipulative, and it's not... I dunno, the bondage is, er, also manipulative and not scary.
*reads up*
Yes, hi, that's not that clear; I swear I am a native speaker... Anyway. I liked this because it was youthful and even with the edge of dubious consent, it was playful, and while we can see how that manipulation is already on the path to a dark place, it's also easy to see how it would be appealing and charming, how Albus would fall for it all, how the moment would be spellbinding and powerful for him.