Serene Hasan's anal licking
"I heard you like this, so I'll serve you with all my might...
I can't be of any happier if I can be of service to you, even though I can only kill."

A girl whose body is made up of toxins and who is the only one who can resist it, serves her anal licking. She is happy to be of service and serves her dirty hole with love, but no matter how much she can resist, if she continues to receive the caresses of his tongue that kneads bodily fluids directly from the mucous membrane,
she is hit with a tingling sensation like her prostate is soaked in soda.
The pleasure and poison make her unable to say "stop" and continue to endure the hell of caresses...
Two hours later, she is rescued by Mash who comes to her room.

After logging in for about 600 days, I finally cleared the first chapter of FGO.
There were many cute characters, but out of the servants who appeared in the story, Serene Hasan was by far my favorite.
(Shuten and Raikou Mama hardly appeared so they don't count, Mash is in a separate category)