This is all purely fantasy.
Of all things while my wife was out of town for a few days on business I came down with a bad cold and really having a bit of a tough time of it. Basically I was spending most of my time in bed fighting the fever, chills, headaches that come along with a bad cold. I was on my own and had to make due with all my medications and spend most of the first day of my sickness out cold in bed.
The first night of my cold I was talking to my wife on the phone and she apologized for not being their to take care of her husband but she said that she sent her sister Mary over to check on me at lunch time. Mary was happy to report back to my wife that I appeared to be ok and she did not want to bother me because I was sleeping away. Now upon hearing this this really through me for a loop because at that time of the day I was fighting one of those sweaty hot times and had stripped naked and kicked off all the covers on the bed.
So right away their was no doubt that my sister-in-law had seen me naked and sick as a dog in my bed. As I finished by conversation with my wife I just assumed that my sister in law did not mention to my wife that she saw me naked. My wife would have said something to me if that was the case.
After the initial shock and embarrassment of my sister in law seeing me naked it then turned into a bit of a turn on and I found myself getting a raging hard on the more I thought of her seeing me naked. I quickly realized that knowing my wife, she would send her sister to check on me the next day as well. The big question would be would my sister in law actually show up to see me naked again or would she be too embarrassed to show?
Just to give you and idea of what my sister in law looks like, she is 32 5 foot nothing, about 110 pounds with blond hair and blue eyes very nice smallish breasts. I have often had thoughts about her when we have them over for dinner or go out for drinks from time to time. But never had I imaged anything more than that. Me, I have been an athlete all my life and keep in very good shape all year round (for a 36 year old).
So it was just before lunch time when I knew that if my sister in law showed up that it would once again be lunch time so of course I was naked and sporting a raging hard on with the thought of her seeing me again naked. Basically if she showed up again then she definitely wanted to see me naked again. So as not to make it too too obvious I was totally naked but did have the covers up to the tops of my thighs.