confession from retail hell

so like i work at a big box store and its the worst job ever, u know? i mean it pays my bills but there are these people. always so many of them. anyways, recently this thing with a coworker started happening and i wasnt sure how to take it or even if im supposed to be talking about it like this. her name is lila and shes kinda in charge but not really. anyways she's been giving me extra attention and its weird cus sometimes it feels like shes being nice and other times she seems all bossy like shes trying to discipline me or something? i dont get it, but there are these moments when im at work and she comes over and we just look at each other and i can feel my heart racing. one night after a shift she pulled me aside and said some pretty intense stuff about how i need to be more responsible at work and then she kinda brushed her hand across the back of my neck, it was really intimate but also kinda scary cuz i know shes older than me (shes in her late twenties) and its like, not okay right? but we kept going with this dynamic where im supposed to do extra stuff for her and be more attentive to her. then one day outta nowhere she pulled me into a supply closet and kissed me. it was weird cus there i am, in my twenties, getting kissed by someone way more experienced than me and acting all submissive like i dont know what im doing. its confusing but also kinda turns me on cuz shes this authority figure and i feel small around her sometimes. we ended up doing some stuff that day that felt really intimate but also not okay since were at work. i dont know if i should tell hr or pretend it never happened. im just writing this to get it out there, anyone have any thoughts?