I walked shirtless to the mirror wardrobe and pulled it open. As I did this, the mirror changed focus and I noticed something out of the corner of my ...ye, a shadow was cast across the room and I turned around to be standing face to face with my girlfriend’s sister, Edith, staring straight back at me with her eyes giving me what seemed like a once over. ‘Oh shit!’ I said out of shock, feeling a little embarrassed that she’d seen me in such a compromising position, I mean I was practically in my. I knew that was not an easy decision for her.She'd cycled through many clothing choices in the last two hours before we had to leave for the event. Only one outfit was the typically reserved type expected for a formal event. Well, that would never do! She'd even considered her favorite sexy pants.It was very tight, clingy, and near sheer white. From the rear, we could see how well the high cut waist and tailored seat shaped her tiny ass into an impressive pear-shaped lusty delight. The legs. We all took our places as Grandpa eased the boat into the slip. Once it was tied off, I brought everyone's belongings topside as we all said our goodbyes.I went back to closing things up after they all left. About thirty minutes later, Grandpa and I were sitting on the deck enjoying one more beer. Always looking for his input, I asked, "So how do you think I did on this one?"Grandpa leaned forward and handed me two envelopes. The first was my pay from him and the second had 'Stevie's Tips'. His cock is so fat and heavy it made a thud when he dropped it on her. His cock was very wet with her juices. Large patches of white foamy pussy cream streaked his entire cock. When I turned and looked at him I noticed a different kind of lustful look in his eyes that I have never seen before. I felt by his expression that his lust for my wife may be too much for her to handle. This was evident by the amount of precum that was leaking from the head of his penis. Almost without thinking, I moved.