Is this a thing with narcs? It's unsettling how many comments there are of people with similar experiences.

Thankfully I've never had it happen to me personally, but I used to work with a woman that openly bragged/boasted about having sex with her then boyfriend in front of her child. How "funny" it was to look over and see his little eyes watching them in the act. Most people would stop at that point, as it's USUALLY a mood killer or you simply want to maintain their innocence a bit....but from the way she talked it was like she loved the "edginess" it. Kid was like 3-4 years old at that time, his mom was at least in her mid thirties.
She acted like I was a puritan for calling out the absolute creepiness about it, and how it's still a form of sexual abuse even if it's not direct.
She was also my supervisor, which was worse.

Looking back, I think she absolutely was a narc.