The Undertaker's Friend... {Sebastian x Male Reader}

I obviously don't own any of Black Butler, that honor and glory goes to Yana Toboso.
(The cover is also not my own art, I can't draw that well, I promise.)

Basically you are a gay man chillin with his homie in london but then a hot dude comes and snatches you and you let it happen because he's hot. (I'm kind of joking?)

Here's a serious description:

Ciel and Sebastian take on a new case, but they're stuck with no evidence other than the corpses left in the murderer's wake. They go to The Undertaker for help, but instead find themselves getting their information from a friend of his (hence the name of this story).

Now, let the story CUMmence...