A Secret from the Night Shift

I work the night shift at this coffee shop and it's pretty dead most of the time. One night, my partner who I'm in an open relationship with asked if they could come over. We'd agreed that this would be okay as long as we were discreet about it. They showed up around 2 AM, when no one else was around. We sat in a booth and just talked for a while, then things got heated. It felt wrong at the time because I work there but also kind of exciting, you know? The place is so quiet and empty that night everything seems possible...but also maybe too risky? I'm still not sure how I feel about it now.