You offer her the other one

Slowly you regain consciousness. You find your neighbour running her hands gently through your hair, coiling it around her fingers with your head resting in her lap. When she sees that you are awake her eyes brighten and she runs a finger over your lips and kisses you on the forehead.

“That was amazing,” she says softly in your ear.

From your lips her finger traces a path down your chest until eventually it reaches your cock. She reaches around it and takes your ballsack in her hand, fondling it gently. Your eyes follow her finger down and watch as she plays with your sack. It’s obvious that there is nothing left of your left nut but paste, easily running through her slender fingers. There is still a dull ache from what used to be your left ball, but all you can think of is how incredible those final moments felt. You want it again. You know you can only have it once more, but nonetheless you want it, you need it. You can tell she does too, as she gently squeezes your remaining testicle.

You reach down and cup your hand around hers, closing it over your right ball.

“It’s yours,” you whisper, “take it.”

You realise that keeping it would be pointless. She was right when she said that it was amazing, it was the best orgasm you’ve ever experienced, and after that anything else would pale in comparison. Her face breaks into a broad smile, and you think that if the Sun could smile it would look like this. “I was hoping you would say that.”

You are too weak to stand so instead you both move over slightly to lie on the soft grass. She wraps her hands around your head and you kiss passionately. You spread your legs wide, and guide her knee into the space between them.

“Ready?”

“Yes”

She lifts her knee and slams it down into your last ball. Already your cock is rising to attention at the prospect of what is to come. She moves one hand down and begins to stroke it, as you caress every inch of her body. Again, and again her smooth, supple knee crashes down. It fits perfectly in the gap between your legs, or at least it would if it were not for your right ball.

Even as the strength of your right ball begins to fail the rest of your body is re-invigorated. You arch your back to meet her incoming knees, and thrusting against her hand. You both moan, her in pleasure and you in a mixture of pleasure and pain. Your ball is swelling in your sack, almost as if to make itself a better target and ensure that she can’t miss.

With each blow of her powerful knee your one remaining testicle gets flatter and flatter. Finally, just as you feel it begin to give way you reach climax and a rope of cum launches from your cock. You feel her shiver as her climax approaches too. Again, her knee slams into your ball, harder than ever, and another rope of cum shoots out of your dick. She raises her knee once more and you can tell this will be the final blow. Your back strains as you arch upwards to meet the deadly impact. Her perfect knee crashes into your nut like a freight train. You can feel it straining against its limits as it is **** flatter than any testicle is meant to go, until finally...

POP!

There it is at last! Your right ball explodes under the devastating **** of her knee and a wave of glorious, agonising pleasure sweeps through your body. A huge, thick wad of cum erupts out of your dick, almost as if the whole of your right nut had been **** out of it. You had thought that nothing could ever top your last orgasm, but this one is even better. A violent shudder shakes through your neighbour’s body as she orgasms too.

You both collapse into the grass, completely spent, and in your case permanently. As your vision begins to darken once more you contemplate what you’ve just done, and don’t regret it one bit.