Jenny stared down at her cock sticking out a foot in front of her, puzzled as to what to do with it. "You... um... you've gotta pull on it, honey, play with it. It'll stop being hard if you do." Her dad was standing over her, looking at her worriedly. She gingerly wrapped her hands around her new penis, pulling on it, rubbing and panting, feeling humiliated as she felt daddy watching her masturbate. She felt antsy, jumpy, and slowly began to realize what was happening. She wanted to stick it in something, to pump in and out and know she was dominating whatever it was.
Jenny barely noticed herself squealing as she pulled harder and harder with both hands, stroking the tip, swinging it around, overwhelmed by the feelings coming from it... which exploded, in one great shuddering scream. A white goo spurted out, scaring her, and spraying onto her floor.
Her cock was quickly softening, and as she sat on her floor, gasping, she thought this may not be too bad. Her dad was gone, and she was getting hard again thinking of what had just happened. Nothing was holding her back this time, as she grabbed it with both hands and pulled and fondled it as hard and roughly as she could; the small amounts of pain were worth a ton of pleasure, quickly coming once again, unaware of just how much she was squealing and moaning and screaming. Jenny didn't think she wanted to give it back even if she could.
She lay on the floor, exhausted and covered by the goo, wondering what would happen to the rest of her family.
