Your stepsister has a date tonight, and she's really nervous! The guy she's seeing has a reputation, and she's never done anything sexual before. You offer to let her practice on you before her date, and she loves it so much she begs you to fill her pussy with your cum after sucking your cock and getting fucked by you (fuck machine). She's SUCH a freak, she wants to keep your cum inside so her date can mix his cum with yours!