We agreed that I could only insert and absolutely couldn't move, but I broke that bond with my sister and went on a rollercoaster of thrusting! HUNTB-369

Hearing about my desire to lose my virginity, I agreed with my gentle older sister that I would only penetrate her without moving. But I ended up enjoying it so much that I couldn't control myself and started moving, thrusting until my sister was completely overwhelmed with pleasure, experiencing multiple orgasms…