"All right lets put Red to the test!""
Charlie pulled the silently protesting balloon out from under himself and placed in the middle of the mattress. He then climbed on top of the bed and squatted over it's face and started to lower himself. As the large looming butt cheeks approached Airhead tried to roll away, but Charlie noticed the terrified balloon moving back on the laptop screen so he grabbed the string and wrapped it around his fist to pull it forward into position.
What little movement Airhead could manage was restricted as Charlie's sweating ass made contact with his rubber face. Nonetheless the helpless balloon continued to struggle only managing to rub itself against the slowly descending ass crack, stimulating the horny janitor even more.
"Ohhh I can feel the rubber rubbin' up against my ass crack." Charlie moaned "I think Red is eager for it."
It wasn't long before Charlies ass cheeks had spread apart and the disgusted balloon's invisible smell receptors made direct contact with the warm butthole, still unwashed after a day of hard work and not smelling particularly nice.
The heavyset janitor continued to put more and more weight onto the groaning rubber. Air inside the balloon began to shift once again to its lower regions. Airhead started to feel like he needed to orgasm again, and the feeling only grew stronger as Charlie descended lower. Eventually all the weight was taken off of the custodians feet and the mass of a full grown man was pushing down onto the miserable squashed balloon.
The space around the knotted airhole was bulging and had turned an even brighter vivid red. The urge to ejaculate all his innards was reaching it's peak. But just as he thought he could take no more the rank asshole began sliding forward from his nose to his tongue and back again as Charlie started thrusting his cock against the protruding air pocket. With each movement the unbearable pressure oscillated in Airhead's strained nether regions. Charlie pulled the string wrapped around his fist in time with his thrusts to give more friction on his throbbing meat against what little remaining rubber surface was not beneath his ass. The string pulling on the pained balloon's little weenie knot gave the sensation of his already sore and flaccid penis being violently jerked off.