Release

Laura watched her sister's joyful enthusiasm with a degree of envy.
The exhilaration of sharing this entertainment with her pupil was delightful, but the prospect of some personal playtime with a younger, inexperienced boy seemed more exiting.

'Enough, it's time to let him go' she said to Rachel in an authoritative voice resembling a disciplinarian.

'But this was soooo much fun!' Rachel declared defiantly in disappointment of the imminent wrap-up.

'I know, but if we keep this up there will be nothing left of his balls for us to play with in the future' Laura regarded her younger sister soothingly.

Rachel reluctantly stepped back and considered her sister's explanation carefully, rapidly running through the captivating possibilities of brutal future entertainment.
Her thoughts were interrupted by Laura's persistence:

'Besides, there will be other boys to play with. We just have to keep this one quiet.'

Submitting agreeably to her older sister's apparent experience, Rachel looked at her inquiringly for instructions.
Laura climbed to her feet just above Paul's head who resumed his fetal curl in the center of the carpet trying desperately to nurse his battered balls, covering them with his hands for protection.
He pumped his mouth in a motion resembling a fish, shifting the cylindrical gag outward with his tongue, until the briefs were finally **** from his gullet, landing on his side, covered in saliva.
He whimpered audibly catching his breath in this short moment of respite as Laura continued:

'Something else you'll learn about boys and their balls, is that they loose all of their strength if you hurt them bad enough.'
The older girl steadily rose to her feet standing just above the top of Paul's head, then smiling deceivingly at her younger sister she finished her instructions confidently:

'Go back upstairs, I'll clean up here.'

'OK, but I know who we're doing neeext.' Rachel smiled devilishly at her older sister and proceeded skipping merrily towards the elevator with a jovial satisfaction, leaving the body of the pummeled young man curling on the basement carpet beneath Laura's feet.
The beaming young girl stepped into the car, turned to face the playroom and yelled out cheerfully:
'Thank you for this lesson, sis!' before disappearing behind the closing doors.

He inhaled oxygen greedily trying to catch his breath and let out a soft cry for help, still too weak and air-deprived to be audible enough for the sound to carry anywhere passed the room which the girls have deviously adapted for their vicious exercise.

Laura slowly walked around Paul's back as he lay in a fetal pile of male anguish, savoring the the calm silence which was only slightly disturbed by his feeble whimpers. She turned to face Paul's legs and carefully picked up the stool so hastily abandoned by her little sister, which was now knocked over on the side by the sudden curling motion of the released boy, then tossed it callously to the side, rolling it under the desk.

Just her and the boy remained in the basement, who lay paralyzed and primed for some one on one hilarity, much like her previous victims.