Wildly inappropriate BDSM fan-fiction harry potter valentines. The only remotely worksafe one is:
hp_hardcore presents Hardcore Valentines! Click here to get your own!
See also the fine line of pixelvision valentines over at Diesel Sweeties
And just to bring it all back to Things Which Are Just Plain Wrong (Yet Strangely Appropriate), when you’re not at work, try searching for Bareback Mountain, the porno knockoff of Brokeback Mountain. Their careful, tasteful homage to the original seems to have stopped at the cowboy hats.