Stretch her out.

You return to the motel later that evening. The room is illuminated only by the light of the television, with the sounds of the porno you purchased earlier that day blaring through the speakers. Silently, Gemma climbs onto the bed and gets on all fours, spreading her thighs wide. On the mattress next to her is your new prized possession - the grotesque length of hard rubber balls that in mere moments, will be inside of her ass. The set of glass beads is barely a third of the size when laid next to the black monstrosity, looking pitifully small in comparison. You take the small black rubber toy in your hands and push it past her sphincter. It slides in effortlessly - for now - until you start squeezing your fist around the pump connected to the other end.

You start to pump air through the tube connected to the inflatable buttplug now nestled inside of her ass. Her anus starts to strain tightly around the end of the balloon protruding out of her, her hole growing wider and wider with each pump. Once you reach about thirty or so pumps, the entire entrance to her ass is stretched taut around the black balloon, as it strains to hold it inside of her. She groans as the entire balloon comes flying out of her ass with a rubbery pop, leaving her ass gaping for a few seconds before it returns to its normal size. You repeat the process several times, getting the balloon up to about fifty pumps before her ass can no longer contain it. As it comes shooting out the final time, the balloon has grown to the size of your face.

By this point, she is almost completely out of breath, stretched to the limit, and collapses face-first into the mattress.