My older sister

So quick context my sister is 27 years old and me and my fat friend were 18 when this happened.
His name was Danny, he was always usually at our house and my mum and sister often got along well with him. One time I came home to a loud house so I snuck in and peaked in my sister's room to find her ankles tied together to a chair while Danny was tickling her huge soles rather hard while she laughed hysterically. The scene didn't last long because soon Danny went to fuck my sister's soles while my sister caught her breath but didn't protest as he finished on her soles.

Very interesting story! Thanks for sharing your experience here.