She wanted a lift home, so I agreed; if she was naked until we got back to her house... We drove around for 15 minutes, she walked around the streets for a bit while I took pictures and made sure she couldn't unlock the car for her clothes, then we walked to a local high school and had some awesome outdoor sex on the oval :D
After that, she got the lift home she wanted.
Since then she mustered up the courage to get naked without invitation at a friend's party that I was unfortunately absent from, but if it happens again I refuse to miss!