Sorry but I never realized that that piece of soap was in the shape of a flower. Now the mystery has finally been solved.
For the last couple of years, when I was done doing you know what, I washed my hands with that piece of soap on the bathroom sink.
Now that I think about it, I had noticed that it was of an unusual shape. So unusual in fact that to me it only made sense turning it upside down, as that way it lay more firmly in place. It had never ever crossed my mind that that shape was a flower to be returned to its spot with the flower side lying upwards of course...
A beautiful attractive piece of reddish violet soap ready to be fondled by the next pair of hands.
This mystery had been bothering poor Thea for a very long time, that is until she caught me red-handed. So you are the one!
Yes, I was the culprit all along, and I hadn't ever realized it.