Caught Up in My Student Days Nightly Fantasy

I can hardly believe I'm writing this down, but it's driving me insane and I need to let it out somewhere. Married for a couple of years now with no kids yet, and despite the strong bond between my husband and me, there’s this dark little fantasy that’s been haunting me since college. Every night before bed, images flash through my mind: the way one of my old profs used to glance at me during lectures, those deep brown eyes staring right into mine as if he could see straight through to my secret desires. It wasn't just him though. During that time, I had this crush on a senior who was twice my age, his hair so long and curly, the stubble on his chin making him look rugged in a way no boy ever did. There were nights when we'd meet at the library late, and as the hours slipped by into darkness, something always felt different between us. And then there's this vivid scene that plays out every night now: me standing before one of my classmates who I secretly loved back then, he’s got a wicked grin on his face as he closes in. His hands roam over my body, pressing against the material of my clothes until it feels like we’re about to combust from all that pent-up tension. The way his fingers slip inside my panties... and how I let him take control, pushing me up against the wall with a hunger that consumes us both. Is it normal to fantasize about these types of people when you're in such a committed relationship? How do I reconcile this deep-seated part of myself without hurting anyone?