"It was your wish. Maybe he'll be more willing to explain things to you?" suggests Lydia.
"Maybe. Only one way to find out..."
You pick up the lamp and rub it. Smoke pours out of the end of the lamp forming a large cloud that hangs in the air. A figure slowly forms within the cloud which disipates around him. You recognize this as the same genie from the day before.
"Greetings. I am the transfor...wait, I recognize you. It is very rare that anyone ever rubs the lamp of the Transformation Genie more than once. It was...for you, it was yesterday. Your wish..."
The genie went into a perfect immitation of your voice: "Genie, I have long had a fantasy about making love to a mermaid. I wish for you to transform my girlfriend temporarily into a mermaid so I can fulfill this fantasy with her."
Returning to his normal voice, which had a slightly haughty Arab accent: "So did you enjoy your wish? Get to fulfill your fantasy?"
Your face turns a bit red. The genie grins wickedly.
"Excuse me" interrupts Lydia. The genie turns to see her sitting on the floor watching him.
"Ah and this must be the lucky lady. Enjoying your boyfriend's wish?"
"For the most part" she says. "But it doesn't seem to have worked quite like it was intended." She holds up her red latex hands for the genie to see.
"Are you a mermaid right now?" asks the genie.
"No" admits Lydia.
"Then the transformation was temporary as specified by the wish."
"But genie" you say "you told me I could wish for a permanent change or a change that was temporary but could not be repeated. This is the second time Lydia has started transforming. What's going on?"