Simon nodded and smiled, the balls were working like a charm.  His previous girlfriend had responded likewise when he had incorporated the balls into their play.  The trick was constant motion which would set off the little weights inside the balls.  "Not just yet April, you're only on the second ball.  If you cum now, I'll have to come up with a punishment game for when you come back into my arms.  :-)"  Simon paused for a moment to let April luxuriate in the pleasure the balls brought as he contemplated what that game would be.  "Now while you're still standing I want you to draw out the balls again.  Then slide in the balls one at a time until you feel full, April."