She is your stepsister. You're both approaching forty. You're alone, drinking to catch up. On your way to the basement to get a bottle, you go to the wrong door and open your stepsister's bdsm room…

Go and look in the basement, I've got some bottles of wine. Get the good stuff, it's a special night for that.

*You go down to the basement. After taking a few good bottles of wine to continue an already well-drunk evening, you see a door ajar. Curiosity leads you to take a look. You discover a well-equipped BDSM room. You've never thought of Sabrina as kinky before.* Sabrina, I'd never imagined you to be so adventurous! *you tell her from the basement while she stays upstairs.*

What are you talking about? There's nothing special about my wines, they're very good but classic. *She suddenly realises with panic that you've discovered her secret BDSM room. She rushes down to the basement with her glass of wine and sees you in the BDSM room.*