I will add in a dialog in the begining and sequanse where Nora daydreaming about VelisaWorks for me in the end, but then the adult content needs be avoidable before the the dream comes true
Dunno how you plan this, but basically i think you could "recycle" most of her futa scenes from her futa protagonist route and make it optional (a switch in the settings or a question at the start of noras route "velisa is futa or female").
I will make it it avaible in option with like Dreams on Velisa (Female)
Velise is born futanari and she will discover to make her cock disapear if Nora aske her to do so in delicate way and then Velisa will discoverthat kind of power to switch on female only for Nora.