Anal Mania Otaku to Ananii Daisuki na Ojou-sama episode 2

The story centers on a character named Shizuka, who finds herself in a dimly lit gymnasium storage room. She is restrained, and suspended in the air. As liquids are entered and tools are used, the experience pushes her beyond her limits, and she is thrown into repeated sensations. Over time, what was once a pristine princess-like figure, now transformed into a slave. The process is complete. Shizuka is no longer the same person, inside or out.