There is only 2 endings i am hoping for.
First is the MC and Sensei escape, and the MC spends the rest of his life in peace with his loving & gentle mommydom Sensei.
Second is actually a multiple different endings rolled into a single start-up style, thanks to the MC's efforts his Sensei either escapes safely or is let go.
But thanks to the corruptive femdom influence from all the dominant goddesses, he decides to stay with them and chooses his perfect new mistress, and spends the rest of his life in submissive bliss & service to his chosen mistress.
I dinnae like betrayal, so if any of the evil goddesses asks me to betray Sensei, unless it's sexually submitting to one of them so she can rub Sensei's nose in her conquest of the MC's mind, body, heart and soul, I'll be flat out refusing, I will not let Sensei get hurt or killed because of my choices.