I can't get past the fourth lesson, it eventually stops giving new stretches and effectively enters sandbox mode at that point. It might have something to do with the left hand being extremely out of reach, to the point you have to move the torso out of the position the stretch asks for
Viewing post in Stretch Me Right! (+18) comments
[Edit] I uploaded a new patch fixing this issue! You can check it out in this post Stretch Me Right - Portable v1.2
I will try to add more body customization in the next update :)
The missions are designed as introductory lessons. Once you complete them, you unlock free mode along with all Lewd Mode content. It’s possible the in-game dialogue doesn’t make this clear enough.