His other hand begins to rub my pleasure spot and mine returns the favor. We engage in the heaviest of petting when we hear other 4 wheelers coming up... the trail. As they pass and the moment is broken. I get off the 4 wheeler and we put on our helmets.I take over driving. I could feel his hard cock poking into the small of my back. His hands roaming over my chest as I drive are very distracting. The heat radiating from between my legs is driving me wild. We ride for another 20 miles or so and. Of course I was ready and hard in anticipation. There was candlelight in the room and I was instructed to keep my eyes closed.I felt a body get in bed with me but the tits that pushed against me were lots different than the ones I was expecting. Fuller and softer. Then I heard Mary Beth’s mother say, “Happy birthday, I’m your present!” I damn near ejaculated right then.My present was wrapped in a sheer nighty and I took my time unwrapping it. First I explored the magnificent rack I had often. Everything was a pristine white."Christ," I said under my breath."To access the laboratory, you must wear clean room garments. We maintain ultra clean room conditions." The professor sounded like a proud tour guide. "You may, however, look through the viewing windows." Somehow, as he spoke to us here on his turf he looked more like a keen scientist than a mad professor."This is all a part of a prehistoric mine complex that opens up into a series of natural caverns. There are cave paintings in. “Where is my surprise “He asked me.“I just called her .She is on the way. By the time let’s start our beer “I told him and asked to sit in our sofa.We both opened one beer each and finished it.“Arae yaar how long I have to wait for my surprise ” Vinoth asked looking frustrated“Wait wait lemme call her” I told and I called my sister“Ash… Ash”“Hey u told your parents are going out but ur sister is still home” Vinoth asked me in shook.“Of course I said my parents are going out but never told about.