Dylan couldnt control the stirring beast between his legs. It started fattening, growing hard and fast, poking out straight ahead then standing straight up. 'Holy shit Dylan, since when were u hung like a donkey?' Karen asked. At 16 she had seen one or two cocks in her time but never something like this. ' S... Since today i guess' Dylan stammered. He told her about the medallion, the towel and the growing cock. 'Let me take a look' Karen said. Dylan wrapped his hand around his massive manhood and shook it towards her, 'Its real sis, believe me!' 'Haha not at your cock BIG brother' Karen giggled, 'Let me look at the medallion.' He fumbled for the medallion and passed it to her, both their hands touching it momentarily. 'ZAP!' they felt a tingle pass through their bodies...