The rate gradually slowed down, and simultaneously my sister started trembling with all her body and moving her pelvis. At each movement of my hand up...the trembling grew, her pelvis came up and she issued faint sounds, pent-up groans, mostly like whimper. Finally the synchronized movement of our hand almost ceased, but the groans became more distinct and mixed with her wild breathing. She was approaching the edge. My penis, all my parts overloaded with sperm experienced a painful wish to. She was already very wet. Her hips pushed closer to me. Then I heard Tripp speak to Monica. Looking up, I saw her standing next to us with a whip in her hand. It was leather and had many tassels. "Go ahead Monica! And Rachael, keep up with your job." Once again I placed my mouth over her pussy. I let my tongue pass over her swollen clit and she moaned louder. Then she yelled out and we both jumped as the whip struck across her breasts. "Ahhhhhhhh." Swack! "Ahhhhhhhh!" Swack! "Stoooooop.. The mannerisms were familiar though, and the scared look in her eyes as I approached her made me sure this was her."Lisa? Is that you?" I asked wanting to find I'd made a mistake."Yes." She had a small scared small voice that seemed out of place in someone so large."You look ... different," I said."It's still me," she said, sounding close to tears.I looked at her closely. I could almost see the old Lisa behind her eyes trying to reach me. The package wasn't that important. It would take some. They came into our crib room one day, woke us from our afternoon nap, and removed our harnesses and dildos. They each were wearing a harness with a large penis shaped dildo sticking out in front. After getting us up on our hands and knees on the edge of the bed, they lubricated our pussies and the dildos and slid into our well stretched cunts. It felt wonderful as they pumped in and out, giving our cunts a good fucking, and talking between themselves as to what wonderful submissive little girly.