I'm a guy, but I'm good at sewing, so I was asked by a girl who loves cosplay to make a cosplay costume! She came to my room to get measurements and try on the costume, and I was completely exposed to her changing clothes! I was annoyed that she didn't see me as a guy, but I was surprised at how cute she became in cosplay! I couldn't contain my arousal and frustration, so I pushed her down and fucked her!