My girlfriend and I decided we were going to spend our Saturday by the lake, swimming.  My girlfriend shows up wearing a two-piece bikini, that made her look hot.  She smiled and asked me if I would like to go swimming now.  I replied with a yes, so we both jumped in.  I was out there swimming circles around my girlfriend, until I noticed she's taken her bikini off.  Now, she was completely naked, underwater.  I just sort of stared at her until she said 'I'm all yours'.  Cool.  I start rubbing my hands on her breasts and kissing her on the lips and neck.  I start then moving my way downward.  My hands run past her stomach, and I start rubbing her legs.  Then, she grabbed my cock and started stroking it.  So, I re