Falling Into Play

I'm a grad-school dropout now, and I've started playing Daddy with my partner. We agreed on it, but I feel so ashamed talking about it even here. She's in her twenties and just graduated college, but she wants to play like I'm her real dad. It's not sexual at first, but as we go further into the roleplay, things get... more intimate. I find myself spanking her gently when she doesn't do what I want, like a real father might with a naughty child. The way she responds, looking up at me with big eyes, just makes it all feel so real and intense. It's like stepping back in time to when everything was simpler but also more confusing. I know we're adults, that this is consensual play. But I worry if there's something wrong with me for enjoying being her Daddy this way. Is it normal? Should I tell anyone else about this or keep it private? How do other people handle these kinds of intense roleplays without losing themselves?