I'm not sure if its a story or gameplay suggestion, but a way to keep a low acceptance run while ending up super girly. Also, I'm a sucker for lactation, and I could see it becoming a secret menu type thing if you keep leaking through your uniform.
yeah, basically never quite fully accepting her changes even as everyone around her does stuff like using her submissive nature to make sure she doesn't feel confident enough to resist. In short, compliant but resentful, and every so shy and blushy about it. you know, like go back to wearing guy clothes and you can end up restricted from wearing pants.
These are in no particular order...
Members only back room at the nightclub that's a sex / fetish play dungeon.
Job opportunity at the unmarked (sex toy) store. MC can earn extra cash giving demonstrations.
Fetish clothing (latex, leather, etc) and BDSM toys at the unmarked store or clothing store.
Threesome scenes, MC in between two men... MC and Eve double teaming someone... MC being double teamed by Beth & Jane.
Domination / betrayal from sister or best friend, MC is restrained and then "rented out" at the sex club, or trained to service the person dominating the MC.
Had a thought regarding the transformation chamber/pod and ChemMaster formulas in Jane's lab at work. Using the existing "create new formula" idea, combining the nanobots, truth, and lust you can create a Bimbo formula that increases lip size and minimum sexual arousal, the desire to wear as little clothing as possible, and reduces intelligence. Getting the target to drink the bimbo formula is a temporary change, applying the formula through the transformation pod makes the change permanent. In theory the permanent change could be applied to the target even if they have not gone through the initial transformation.
Also, if there is an eventual "airhead bimbo" stage the MC can reach, halter / bikini tops, micro mini skirts, collars & cuff sets, along with body jewelry (hoop earrings, nipple piercings, etc) could be an option.