Girl pampers her friend with anal fisting during FFM sex

The rich grandfather has a ton of money and he prefers to spend it on his favorite hobby - hard BDSM with two ladies - older and younger. Well, what lengths will a perverted brain go to in pursuit of entertainment? Well, if grandfather likes to fuck and spank his girlfriends on the ass with a book or simply fuck brains, provided that he is paid for it, then let him have fun...