She said she had never cum from oral before. You thought you could prove her wrong so she bet you that you couldn't do it, and would be locked in chastity until you made it happen. Perhaps you were too confidant in your abilities. You thought you would
It took you months, but you finally managed to feminize yourself and become fairly successful on the internet as a sissy. Now your room and looks match and you don't think you'll ever escape it.