Rin Tohsaka's Defenseless Anus (Anal Sex)

Her lewdness is a great nightmare.

Her anus is defenseless.

It contracts every time I move, looking like a second reproductive opening.

Tohsaka's Anus.

The dirtiest part of her is right in front of me.

(Added a meme edit of the original reference image, as well. Naturally I do not own this, all rights to Type Moon, etc.).