Your Sisters Nightgown

You arrive a day early to help your sister set up for a family gathering. As the two of you prepare for bed, she notices that you can’t seem to keep your eyes off of her skimpy pink nightgown. You reminisce about a similar nightgown she had when the two of you were growing up, and the lingering effect it had on you both. Confessions of mutual teenage fantasies lead to parallel masturbation. She orgasms while looking into your eyes and begs you to paint her pretty tits and nightie with your cum.