I think maybe that the Kiss Stance, once Stamina < 0, should immediately break out of it (I think this should apply to all stances where the character is the one who is in charge, as in not receiving). The rationale being that while in this dominating stance, you are technically grappling with them from behind (given that you transition into this stance from a Full Nelson), holding them by force, requiring stamina.
P.S. A bit off-topic, but... your game is amazing, literally 2nd place for me after Corruption of Champions, and I have spent countless hours playing it so far. As well, your artwork really makes every character (male or female/futa) extremely appealing. I personally really like the idea of using text boxes rather than walls of text for the narrative, as it makes it more interesting and keeps me interested in whatever will happen next. I can't wait for what this game will look like in about 6 months from now, thanks for everything!