Is it normal to fantasize about people you work with?
Mostly.Normal for most people
Yes, it’s normal to fantasize about coworkers sometimes. A private thought isn’t the same as acting on it, so keep things respectful and professional at work.
Work puts you around the same people a lot, and attraction or curiosity can show up even when you didn’t plan on it. Plenty of people have passing fantasies about someone they work with; it doesn’t automatically mean you want to pursue them or that anything is wrong with you.
The important part is how you handle it. Keep the fantasy private, respect their boundaries, and be especially careful if either of you has a partner or there’s a power imbalance. You can have a thought without turning the office into a romantic subplot.