Resized to 94% of original (view original)
Artist's commentary
A glass-walled bathroom!
You're staying at a high-class hotel with your two female classmates,
but the room's bathroom has glass walls, and everything is entirely visible!
If you peek, maybe you should pay their hotel fares...
At Ci-en (Part of it is available to everyone)
https://ci-en.dlsite.com/creator/4565/article/735235