Why not

Frank couldnt belive that she turned back around. Curious he stepped into her room when all of a sudden she turned back around. "Hey im not mad but can I have some privacy." Susan asked. Putting the pieces together Frank had a plan. "You dont mind when im in here. You especially love to change in front of me." He stated curious if his command would work. Susan once again seemed to accept his logic grabbing her shorts and sliding them on before moving to collect her bra. Frank a little disapointed got an even more ingenius idea.

"Come on Susan you cant go to school like that. Here let me pick your outfit to wear." He chimed hoping to get her attention. "Yeah I guess your right what should I wear instead then." Frank began to look around her room before having another idea. Pulling out a pair of leggings he handed them to Susan. "Here this should work." Frank watched before his very eyes as she pulled off her shirts and tugging off her shorts and panties was now completely naked in front of him. Grabbing the leggings from him she slipped both of them on. "Thanks for helping me choose an outfit but I really need to get some things ready for school." Frank could feel how uncomfortable his crotch had gotten. Her stepsister looked beautiful. She even seemed to have shaved her pubes leaving her pussy bald for his pleasure.