Squeeful Rec
What a lucky gal I am! Just days after my gift for hp_yule_balls was posted, I woke up to find my gift for snapelyholidays (somehow while berating myself for signing up for two exchanges, it never really occurred to me that this meant I'd get two presents) - and what a gift it is.

I think I know who Surveillance is by, but if there's doubt, it's because I'm so very fortunate to know more than one person who could have written something so perfect for me. The pairings are Snape/Slughorn and Snape/Dumbledore, rated NC-17, with warnings for dub-con (though as the author points out, it's a case of a character who would be consenting currently being incapacitated). This story is hilarious and hot, and features a contrary virgin Snape, a hedonistic Slughorn, a jealous Dumbledore, and some magical twists along the way.

A lovely way to warm up on a cold winter's afternoon.