My trans partner forgot I was trans

My partner (trans femme) bought a fantasy flesh light for herself. I don’t care. But then looks at me and says you better not use it mister. I just gave her a confused look and pointed down there and said how do you think I would use it. Her eyes widened and said something along the lines of I totally forgot. Just for context I’m on t but I am pre op. I love that my partner just sees me as a guy and never questioned me for one second.