My Secret Arousal During Work Calls

I've been with my partner for a few years now, and we have a good relationship. Lately though, I’ve noticed something about myself that I’m really uncomfortable admitting even to myself. Sometimes when I'm on work calls, especially those late-night ones, I get these intense feelings of arousal. It’s like my mind shifts into some kind of fantasy mode where everything becomes eroticized, my colleagues’ voices and the hum of the office background noise, and it feels very wrong but also inevitable. I know this isn't typical or something most people would understand, especially considering we're in a stable relationship. I even find myself struggling to focus on work when these thoughts crop up, which is making me anxious because I don’t want my job performance to suffer for something so personal and strange. Am I the only one who experiences this? Is it okay or should I seek help?