My Girlfriend's Older Sister is a Masochist: "I Wish I Had Met You Before My Boyfriend..."

“Her older sister is a hidden masochist — so I tied her up and trained her hard until she squirted endlessly.”

The older sister of my girlfriend is a hidden masochist. While showing her masturbation to seduce me, she begs for hardcore training. She is tied up, spanked, used as a dog, and made to squirt repeatedly in an escalating forbidden training play.