Suggested fix (unconfirmed): Navigate to C:\Users\User\AppData\Local\Massage\Saved to find and transfer your save files. Ensure you copy the save data into this exact directory on your main PC.
The problem
I wanted to play on my main pc cause if I stream from the other pc the mouse will not activate massage! I copied the entire folder and still the game forced me to start on 0
Suggested fix (unconfirmed): Purchase the required self-massage skill first. Alternatively, hold down the left mouse button while placing your hand on the character, then press the middle mouse button.