Boisissy?

Last Halloween my mom dressed me up like a girl, girls underpants a everything. I felt really different like and I know it's weird but I made out with another boy who was my big brother's best friend. I did all sorts of stuff, stuff that boy's usually do with girls and I was like the girl. Ever since then he smiles at me weird like and asks me what kinds of panties I got on? How does he know that I have panties on?