東方全員吸血鬼

Remilia turns Sakuya into a vampire, and everything just goes to hell from there.

It was started by supon, with this pixiv page explaining the rules:

◆Outline

Let's turn all the Touhou characters into vampires and draw pictures of them draining or being drained of their blood!

◆Story So Far

1. Remilia appears to have gotten serious.

Right now → 2. All Touhou characters become vampires!

3. When morning comes, everyone returns to normal and the incident is resolved.

◆Rules

•All participants please use the "All-Vampire Touhou" tag.

•As the project is rated R-18G, please set all participating works to R-18G, regardless of content.

•There doesn't have to be any particular story, though there is continuity between some of the planner's and/or participants' images. Please approach this without regard to changes in backstory or people acting out of character.

◆Must-haves

•Suck blood from anyone—youkai, dolls, ghosts, gods! Turn everyone into vampires!!

•Vampiric acts are as erotic as sexual acts! (pant pant)

•Take it easy on the teen angst/emo stuff.

Here are some of the responses.