Initially it had been a plan to teach Curtis a lesson about respecting his older sisters and not being a sexist asshole. The both of them had wagered in rock, paper scissors to see who’d get stuck in his body while the winner would show him what being a girl was all about and why it was harder overall to be a girl. But then, something unexpected happened. Samantha found that watching her brother awkwardly but slowly getting more “into the part” of being Susan turned her on more than anything she’d ever seen in her life. She’d never been into girls, let alone her sister, and yet she found herself getting hot as she showed the new “Susan” the finer points of the fairer sex. Even more so with Susan in Curtis’ body. Which slowly but surely lead to the slow blossoming idea… Curtis was reluctant, but surely over the days of Samantha showing him things about Susan and being a woman in general he found himself growing more and more into being Susan, being female. His body respo