After a heartbreaking betrayal at her senior prom, your little step-sister feels like no boy will ever want her. You’ve always found her irresistibly pretty, but her lack of confidence has rendered her too shy and awkward to be physically intimate with anyone. She’s certain she’ll never be brave enough to try her first kiss unless she has some experience first and turns to you to give her some advice. Though it feels a little wrong to touch your own step-sister, you both agree that hands-on experience is essential and decide to move forward with a kissing lesson. Sis can’t get enough of your kisses and decides she wants to take things further. She pulls down her bodice to expose herself and asks for your opinion on her breasts. She asks if they make you hard and upon learning that they do, she begs you to show her what it feels like to have sex. You’re in too deep to deny her and agree without hesitation, pushing yourself inside her while she still wears her prom dress. Sex is everything Sis ever wanted it to be, but she’s certain it wouldn’t be like this with anyone else. There’s something special about being with her own step-brother and none of the boys she knows could ever satisfy her needs like you do… (This was originally a custom commission but no personal names are used)