My home life has been pretty insane the past several years for reasons I won't get into, and my wife's sister's home life is insane for different reasons. Because of this, neither my sister in law nor I can get away while our family members get their own vacations, etc. My friends tell me how unfair it is, but I have tried, and there is nothing to do about it.
So, I often fantasize that my sister in law and I are given an exotic vacation together because our families feel badly for us. So, we go somewhere amazing with an amazing hotel, and most importantly a modern and totally exposed shower in the hotel room.
My sister in law is uneasy at first, especially when I take a shower and she does whatever she can to not see me, but eventually she takes a shower and doesn't tell me not to watch, so I do. And her body is so amazing that I can't put it into words.
After a day or two, I take another shower, and she joins me and says it's because the atmosphere inspires her, and she wants to see what it's like.
This leads to sex, and I give her the most amazing sex she has ever had in her life, making her feel amazing and beautiful. Then that's all we do for the rest of the vacation is have amazing sex.
And when we get home, people notice that she is a different person, but no one other than us will ever know.
I have had this fantasy for years now! The chances of it happening are less than walking down the street with a million dollars falling onto my head.