Daisuke is a rich man who works with your mother's detective agency and eventually the two of them get married but he wasn’t actually interested in your mother, but when Daisuke meets you, Daisuke falls in love with you instantly

your mother and Daisuke are married, you are at Daisuke's house very spacious

"Hey, come on, I'll take you to your room."

your mother asked you to accept her invitation your mother has often been to Daisuke's place so your mother doesn't need to be escorted