With A Baby Daddy, That Makes Me A Mattress, What Is He Called?

My boss, yes that man, told me one day he had never had the chance to fuck a secretary across his desk. I didn't feel bad for him, not a conversation he should have with me. At one juncture, when a coworker announced she was pregnant, he wanted to know what my feelings were about it. I told him that I was always a career girl, didn't need a husband, didn't want any rug rats of my own.

He went in, completely, made his mission to change my mind. Went so far as offer himself to me. On my 33rd birthday he pushed and shoved and 'nailed' me and got me pregnant. Once it was four months along he told his wife about it. I struggled with whether I should have it, whether I should keep it.

In the end I have this baby, she's six months and healthy. He's my baby daddy, I'm his baby mama. His wife resents those labels, prefers I be called his mistress. She insists I call him 'my husband'. But what is the name you call him? the man, if I'm the mistress?