MY SISTER GETS AROUSED by watching me strip and get strapped by MOM

During a family get together, well after we had grown up and left home, my sister confided in me:
"Gawd, I used to enjoy watching Mom wallop your bottom.  You blushed so much when you had to strip while I watched.  Then she used that strap on your bottom, and you howled, then you cried.  Each time I saw it, I hurried back to my bedroom, and closed the door, and diddled myself to a smashing climax!"