Title: Lust is but Gluttony's Twin (series)
Fandom: Kuroshitsuji | Black Butler
Pairing: Sebastian/Ciel
Categories: First time, supernatural, virginity
Length: Medium (the series as a whole is about 15k)
Warnings: Underage/shota (13-year-old boy/ancient demon), references to previous non-con (not between Ciel and Sebastian)

Author on LJ:  _newworld

Summary: “Gluttony is your sin of choice, is it not, Sebastian?”

Review: Ciel supposes that demons are free from human desires, driven as they are by their deep hunger for souls. When he suggests this theory to Sebastian, however, he learns that lust and gluttony are overlapping sins, sometimes impossible to tell apart. Realizing that Sebastian hungers for his body as well as his soul, Ciel tries to re-draw the line between the two of them, even as part of him desperately wants to cross it.

The UST in this series is absolutely sizzling as Ciel and Sebastian dance around the line between earl and butler, master and demon. Kagome beautifully layers this new element into the power dynamics that already make the Sebastian/Ciel relationship so intriguing. I loved watching Ciel and Sebastian try to one-up each other in their new game, and I loved the perfectly in-character dialogue. And when they finally do decide to cross that line, the sex is well worth the wait. Part character study, part PWP, and part meditation on the nature of hunger and desire, this series is one of my favorites in the Kuroshitsuji fandom. Unfortunately, since it's hosted on LJ and not AO3, it's also one of those gems that new fans might have to do some digging to uncover, especially as only the final story in the series contains links back to the others. I'm including links to all four stories below to make it easier for readers to find their way across it.

Lust is but Gluttony's Twin
The Thin Line Between
Lead me (not) into Temptation
Lines not to Cross