Erika hopped off the couch and quickly made her way to the door, careful walking with her still semi hard horsecock flopping down between her legs. When she got to the soor she peaked through a side window quick before loudly saying "My mum and dad arent home!" Eventually the salesperson walked off, and Erika ran back to the bottle.
She dropped to her knees in front of the couch, resting in the puddle of mixed cum. She licked some off her fingers as she grabbed the bottle. It was only a moment until she used three times as much as before on her new cock, feeling it quickly soak into the flesh.
It was a split second before Erika was hard again and a waterfall of precum bubble out of the end of her cock. She greedily lapped at it, for a moment forgetting the changes. It wasnt long before she was forced to remember as the weight of her expanding member had it sink to the ground. She could feel it pouring its load onto the floor as grew, slightly lifting her off the ground. It stopped growing once it took up the room, leaving her cock 15ft long, as thick around as a log, and with a head as large as two car tires. The ammount of cum her cock was constantly pumping was leaving the room filling and sticky, it's heady stench leaving Erika's head spinning. The changes continued though.
At the head of her huge cock Erika felt several twinges before the torrent of cum sextupled. She had gained more holes to blast cum with. The room was so full her cock was submerged, bubbles frothing up from underneath. It filled her soaked pussy as she lay down on her cock, rubbing against it as much as she could, beyond even moaning in bliss at this point. After an eternity she stopped cumming and rubbing and shoving as much as she could into her mouth. She found she was still holding the bottle, and wondered how much better she could feel if she took more.