"Oh no, my naughty little sister, I don't think you deserve to feel me come and offer you my love juice," she murmurs before she walks away. I lie there almost in tears at being denied, my own arousal ebbing fast even though my labia throbs with every pulse of my heart. Molly returns and removes the suction cups from my nipples and I hiss out in pain as she adds clamps instead onto the tender, swollen buds. The clamps are linked by strong elastic which pulls constantly at them and my eyes widen as she shows me more elastic which leads to another metal-jawed clamp. I almost beg her not to but I know that my pleas will have no effect on her at all and so I lie there and try not to panic as she teases the nub of my aching clit out from under its protective hood. I cannot do anything but squeal though as she lets the jaws close around the delicate, sensitive flesh. The red rush of pain flows through me in a torrent and I hyperventilate while tears trickle down my cheeks.
I look up through the misty veil of my own agony and watch Molly tease the end of her favourite strapless strap on vibrator up inside her pussy. She smiles at me and waggles the other end suggestively, stroking it up and down with her fingers before she moves in between my spread legs and nuzzles the knob against my aching, tormented labia. The slowest of movements begins to open me up and I can feel the pleasure instantly mingling with the pain as my puffy folds are pierced, eased away from the fat head of the phallus. Molly stops and toys with the elastic, pulling it slightly but even that causes another flood of agony to rise up through my senses and fresh tears to leak from my eyes. The jaws of the clamp seem to grip even tighter around my clit and my nipples throb in sympathy. She releases the elastic and inches the strap on a little further up inside my tight tube before repeating the teasing, making me gasp and shudder.
Eventually, all of the thick cock is ensconced snugly inside me and she bends forward and starts to shaft me slowly, resting her hands on my breasts and making them jiggle gently. I am in heaven and hell simultaneously as pain and pleasure intermingle in both body and mind. Every nerve ending is screaming at me as the clamps move as she does. My bud feels like it is going to explode as it throbs against the relentless grip of the metal jaws and my face is soaked with tears. I can hardly see the beautiful face of my sister as she rides me, increasing the pace and slamming the thick length in and out of my stretched pussy walls and edging me ever closer to rapture even as she nears the brink too. I can tell by the little gasps and cries that echo round the room and that knowledge brings me to the brink.
Molly
I stare down at the tear-stained face of my sister and love the sight. She only cries when she is in extremis and I know that she will remember this session for a long time to come. I can sense how close she is to coming and that adds to my delight and I move quicker, pumping my hips back and forth until the fat cock pistons in and out of her tightness. I reach down and pull at the elastic and her body begins to buck against the restraints and then I pull the clamp on her clit right off just as she starts to come. There is an anguished cry from the depths of her soul and I watch in fascination as spurt after spurt of love juice starts to shoot out of her stretched pussy every time that I pull the head of the strap on back far enough so that just a tiny bit remains inside. My own control slips away at the sight and I lean over her and kiss her, mashing my lips down on hers and poking my tongue inside her wet warmth, gasping out my pleasure into her waiting mouth. My body shudders and shakes against hers, my breasts crushing hers so hard that I can feel the clamps on her nipples painfully on my own softness. Languor and lassitude slither up my flesh after the crisis of my climax and I rest there, still kissing my sister passionately and licking up the salty spheres that roll down from her closed eyes.