Ultimate shoulder rides

Out with the girlfriend yesterday and decided to spend some time at a local lake. After being there for an hour decided to go for a swim. Been in the water for about 30 minutes gave my girlfriend a ride on my shoulders. After about 15 minutes she decided to let me ride on hers. Mounted her from the bank as she doesent like going underwater very much and must of ridden her for a good 10 minutes. She finds it good fun to be the ridee and the rider now.