So, I've seen the rest of the story, and there wasn't much. In ep.4 they drain a couple of other men, but through other infinitley less sexy methods. (Anyway, they say that they are "eating" the man through kiss)
Anyway, I've made a gif of this one scene!
Check it out!:
https://www.deviantart.com/noogm/art/Auakashi-Japanese-Classic-Horror-ep-1-Drain-929055812