I had the older lady lay on the table so the plugged sub could see her torso and what would be happening.
She was no novice, she lay back with her hands over her head, feet flat on the table and knees spread. Her breasts settled over her chest, but the row of clamps would bring those back to shape.
I noticed the tail hanging down between the legs of the bent over sub twitching. It was in a rhythmic cadence from her contractions. I slipped two fingers inside her to feel the plug, and they were clamped in unison with the tail twitching. Not only was her vaginal sphincter clamping on my fingers, but also the tips were pressed on at the same time by the plug through the membrane separating the two passages. It was an erotic feeling to feel the inner muscles of the bowels causing these contractions. She was becoming more distressed but also being aroused, evidenced by the fluids coating my fingers. I twisted my hand to allow my thumb to pinch her clitoris against the two embedded fingers. She moaned and thrust in response, I quickly pulled out which thwarted her orgasm.