She took the gun and saw it had a dial. She turned it randomly, and waited for Jim to regain conciousness.
"ooo...bad doggie, no biscuit." he said, a bit woozy.
"Since you took stuff from me, I'm going to use this thing to take stuff from you!"
Jim's eyes widened. "Wait no, don't..."
"Too late." She fired.
The beam of light hit Jim, and suddendly, she could see his nipples press against his shirt. In moments he had a perfect pair of C-cup breasts. As he tried to make sense of his metamorphosis, she ripped open his button-up shirt.
"No! Those are mine!" Angrily, she turned the dial and fired again.
Jim wanted to protest, except his mouth vanished. This girl was pissed! She fired again, and he felt his cock and balls disappear. No! Not Little Jimmy!
"So this thing steals people's body parts, and it can give them back? Let's see..."
Jennifer aimed the gun at herself without changing the setting.
She felt an odd sensation as Jim's cock and balls appeared on her body. "Oh eww, why did I do that?"
Her skirt had slid around her ankles, and now the bulging hard penis was pressed against her panties, which hurt!
She fired the gun at herself again, and to her relief, the alien organ shrank away and vanished.
"Now that I know how this thing works, I guess I don't need you anymore...oh shit, you got my boobs."
Jim nodded.
"Screw it, I'll just steal a new pair. Hahahahaahaa!"
Jim knew that laugh, it was the laugh of an evil genius! He got on his knees and begged.
"Very well, come with me and help me fix this, or I'll put your cock someplace you won't like!"
She turned and led him home.