Believe me, I was hoping she would just grab me and tell to rail her. Honestly though, the anticipation kinda did it for me. I didn't really even think I'd be able to finish like that but boy, did I ever. Between just wanting to pounce on her, the visual treat she was giving me and her saying "cum on me", it got me where I needed to be.
The thing is, I probably would have rubbed one out later that night anyways so why not? The more aroused I am, the harder I pop so it was definitely better than cranking out a mediocre load into a towel and going to sleep haha.