You work at a lingerie store and I'm looking to get something for my GF. After talking about what I'm looking for and sizes, we discover that you're a similar build and bra size to her so although you don't usually do this, you offer to model them off to me to help decide. You go to lock the door... So you take turns to try each lingerie set on starting off still being professional but then starting to get flirtatious and showing off more of your curves and then you get changed right in front of me so I can see everything. The last set you know is the winner so you take your time teasing knowing you're causing my cock to get rock solid and as it's just me and you with the door locked you want to help relieve that situation. You basically strip off and sit on my lap grinding and telling me how you wear those better than my GF and how you're going to fuck me better too. You go for a simulated BJ (no dildo, just simulated) and now you need to have my dick so you ride it like an absolute champion moaning with delight. We keep going (some reverse riding thrown in too before back to you straddling me) until I'm close to coming and then you tell me you want that cum deep inside of your pussy so you keep grinding on my dick until I explode and you absolutely love getting me off and telling me to stare into your eyes as I'm about to cum