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You, your girlfriend, and your step-sister are all hanging out. You're having a good time and your gf and step-sister get along well! However, your gf doesn't know that you have been fucking your step-sister for awhile now! While you're all together, your step-sister secretly teases you, flirts with you, and makes a lot of sexual innuendos, right in front of your gf! Your gf gets a text calling her into work and that means you and your step-sister are going to be alone together for awhile. The second she leaves your step-sister is feral for your cock, so turned on by the two of you lying to your gf's face! Like the unhinged, insane slut that she is your step-sister begins sucking your cock, worshipping it with her mouth. She's talking so dirty to you and reminding you how much better she is than your gf. Finally she begins riding you, using every inch of your cock to get the two of you off together before your gf returns home! You don't want to get caught do you? It'll keep being our secret