Yo, I found a bug.
So, in chapter 2 during Mugi's mission to bring her candy and after talking to the shop guy, I picked Galya to get the money from. During her sex scene, there's no speed limit when she rides the main character. I kept clicking "Faster" until the game crashed. I think it was after 6 clicks is when it froze and crashed. I tested it repeatedly and I can confirm that I was able to recreate the bug every time.
EDIT: It was 7 clicks, and it applies to her 2nd sex scene when you ask for more money as well.