Sonya grunted when the knot pushed past her tiny entrance and lodged itself inside her vaginal canal, her eyes rolling back as the huge mass strained her flesh over and over with each thrust. "S-stop...hold still," she said, putting a hand back to stop Lyz from moving too much. "Let me take it for a bit." Once Lyz had gone still, Sonya started to move by herself. At first it was only the slow, shallow strokes of a girl with a knot stuck in her, but soon she started to rock forward harder and harder, untill finally, with a hard forward jerk, she popped her pussy free of the knot.
Kiko's face was splashed with a sudden flood of mixed fluids. She no longer cared that this was the juice of some random stranger or that her sister was mixed in with it, she just needed as much cum as she could get.
Sonya groaned loudly as her pussy popped gaped open from the knot, the cold air chilling her insides before she rammed herself back against Lyz's belly, taking the knot right back inside her. The tip of Lyz's canine cock speared through Sonya's cervix in one shot, and the little bunny's body went from empty and gaping to full and stretched again in an instant. She jerked forward again, ripping herself free of Lyz's tether once more before settling into a rhythm of brutally fucking herself with cock and knot. It hurt. Gods, did it hurt, but that was half the point.