I am finding that the game is crashing when I am punishing Rachel, when I put her over Sally's knee. Every time. Cannot advance this storyline at all.
From the dev's previous post (also at top of profile): "if you are on the PC version on an AMD machine and experiencing a crash to desktop during Rachel being spanked on Miss Newman's lap in 0.14.3, some people have been able to get past this by changing a graphics option: shift-g to open the options menu select "Force Angle 2 Renderer" quit the game and re-launch it."