You're at a party with your girlfriend and her best friend is there, she constantly disparages your partner while encouraging you to cheat. She tempts you into her room, away from the other guests, strips for you, tease and then tells you that you can fuck her.
She makes it clear that you don't need to use protection and she wants you to cum inside her.
She plays for you before riding you to climax and then returning to the party and your girlfriend.

In this video I use lots of dirty talk, get naked, spread my pussy and ass and play for you, then ride you before putting my dress back on when your girlfriend knocks on the door and asks where you are. Some teasing with the condom and real encouragement and celebration of the fact you fuck without protection.