What Growly and Nicole said. You can't help what you feel, and it doesn't make you dirty or disgusting. And as Growly said, maternal transference, which is about unmet childhood needs, can be misinterpreted in your brain as sexual attraction.

I have something similar going on, though with paternal and erotic transference, with my male marriage counselor. I shared some of those feelings with him earlier this year, and his reaction was great. Said how common it is in therapy, and it's happened to him before. And he helped me understand and work through some of my thoughts and feelings. (There were a few bumps in the road and some difficult periods/misunderstandings, but we're all good now.)