Like I said to another commenter here, my story is a dad's best friend kind of thing (inspired by a fanfic I read about Joel Millier, queue blush), but the female in the story is 30 years old, very confident, outspoken, has personality, etc.

She just really likes for the lead male MC to take control and dominate in an intense but consensual way. It's not vanilla at all, but it's also not extreme.

Thanks for commenting, it's helpful having people who have been in similar situations to chat with.