Squeeze

"Now that they're nice and sore, it's time to squish them." Laura unceremoniously suggested to her little sister what she considered to be the next logical step in this situation.

Rachel looked at Paul's tear-stained face, eyes closed, filled with an expression of momentary relief as he tried to catch his breath.
Looking back at his ball-sack still trapped tightly by her hand, she admired the outline of Paul's swelling testicles, now large enough to stretch the thin skin of his reddened scrotum, each balls' individual outline visibly protruding with very little left to imagination.

Rachel curled her free hand to cover the bottom part of Paul's testicles, making sure to wrap as much nut meat as possible.
Without looking up she squeezed both hands at once with all the strength her little hands could muster. His balls squished out between her fingers like small bits of a water balloon on the verge of bursting. The strength of Rachel's grip shaded her fingers with an increasingly whitening tone, in remarkable contrast with Paul's rapidly darkening red orbs.

Paul screamed barely audible through his gag, staring wide-eyed at his source of pain, as the cruel girl assailant cackled at this new pitiful reaction at molesting hes most sensitive parts.
Rachel casually rolled her hands left and right, examining bits of the trapped boy flesh from different angles, maintaining steady pressure.
Paul's legs kicked frantically against the stool, kept down by the weight of the young girl squatting widely on top, ignoring the clearly visible upskirt she was presenting to her victim. His arms flailed desperately and without direction, immobilized by Laura's grip.

Rachel, who still giggled uncontrollably at the boy's animated reaction, felt her hands begin to tingle with soreness.
Paul sobbed uncontrollably, moaning softly through his nose and trying to plead with Rachel using only his eyes.

"Time to move on" she thought and looked up at her older sister.