It was summer and 90+ degrees outside. My wife and I were by ourselves; the kids away at camps. My self-conscious wife dared to sport a bikini to sunbathe. She asked me to put sunscreen on her. She laid on a towel facing up, and then facing down. She then asked me to untie her top laces. She became enthusiastic and I noticed the neighbor's wife watching. That made me excited. My wife didn't know about the neighbor, so she asked me not to stop.