The idea and concept are very good, but it's still too open-ended.
With so many possibilities and choices, I think you should limit it to more than three characters with three stories.
Will Daniel only be passive with the Dickgirls in Sabrina's, Vanessa's, and Janet's routes?
Will Missy be both active and passive with other Dickgirls?
Will she be active with male figures as well?
Janet's body swap is interesting, but I'm curious to drag her to the bathroom and Daniel helps Janet with a nice blowjob, she cums in his mouth, they kiss, Janet returns the favor, the atmosphere heats up, Janet asks Daniel to fuck her ass, Daniel is close to cumming and seeing Janet's hard penis, he switches places with Janet and the two end up in a nice 69, both cumming in each other's mouths. 
