I threw my entire weight into each thrust. Slamming into her, giving her no respite before the next hammer blow. Her hips were already turning a sickly yellow with freshly blossoming bruises were my fingers clenched. Sweat ran in unceasing rivulets down a back tight with strain, desperate to arch back. Desperate for any movement that would take her away from the merciless pounding. But the leash was taught at her neck. She was trapped, almost immobile as I filled her. Driving into her with a will I made even this most private place mine. Forcing her to adapt to me, making her quivering flesh bend to my will.
Her entire body trembled. Shook. Her breath was in hot gasps that struggled past her collar. Blue eyes wide, barely focused as pleasure slowly subsumed higher brain functions. Only good training stops her from plummeting over the edge. She convulses around me, her body desperate to trap me inside her, to leave her filled, to finally plunge over the edge.
"There's a good slut, cum for daddy." I growl with a sharp tug on the leash.
She spasms once and explodes. Incoherent mewling escapes lips slackened by a vacant brain. I can barely hold on as I pull her off me.
"Get your mouth down on it whore." I pant, my restraint almost gone.
Reaching down I grab a handful of hair yanking a greedy mouth down. I drive my hips up, forcing myself into the mouth no less powerfully than I had the pussy. Once again my grip is unyielding, becoming painful as I see my own end approaching. I might have issued a warning, or grunted in primal satisfaction, but in that moment I didn't care. It was my turn to explode.
When I return to my senses I am gratified to find an eager tongue and excited lips still exploring me. Chasing each drop of precious liquid along my entire length. Sucking blood back away from the head I should think with.
"Get down there slut." I command dreamily, and promptly feel a more experienced if less exuberant tongue join the first, "Show your husband how its done."
Propping myself up on the pillow I look down to watch husband and wife servicing me in perfect marital harmony. Not exactly what I had in mind when someone asked for my help getting an anniversary present, but not bad either.