BF's Swinger Stepmom

Part 2 in my Swingin' Stepmamas series. Has some references to the story in Part 1 but can be enjoyed separately.
You help your best friend's stepmom bring a load of groceries into her kitchen. This is the first time you've talked to her since witnessing her at the swinger's party at your stepparent's house the other night. She knows your stepmom had 'the talk' with you and she speaks to you with a new openness since you are "in the know". She's still a bit of a hippie, and a wannabe nudist, so it's a bit puzzling why she hasn't been able to tell her own stepson, your best friend, about their swinging ways yet. But she seems to relish being able to talk with you about it, like she no longer has to hide such a major part of herself. And it is beyond exciting for you to see your best friend's stepmom with her sexuality unleashed like this! You got to see a little bit of her in action at the party the other night (although your eyes might have been drawn elsewhere at the time), but now she's got your full attention. After she promises you that her stepson will not be home, you let her lead you to the living room where you two start getting frisky. When you are too deep into it to stop, you become aware of some sounds down the hall. Without skipping a beat, she tells you it is her husband, and to keep going because you're doing great!! She tells him to take a seat and watch. You're a bit nervous, as you've never had an audience before, but she is very encouraging. Like she said, "A whole new world has opened up to you", and you're only to happy to experience all the possibilities