Still partly asleep, Ethan obliged, missing the sarcasm. He’d never put on women’s underwear before, but these seemed to fit surprisingly well. They didn’t seem too tight at all, not nearly as tight has he expected, though they didn’t hide his manhood well. “These actually feel pretty good, though they’re not my style.”
Ava looked up “No, just no.”
“What? You don’t find me sexy?” he posed a little and then headed towards her. He could feel an erection beginning, but then he fell. He had the strangest sensation as his legs tightened, merged and became covered with the same green scales that spread from the panties he was wearing.
“Ah! What!?”
Ava heard him fall and stepped around the bed to check on him. He was lying on the floor, still wearing his bed shirt, but had a tail instead of legs, much as she did the night before.
Still holding the calendar, something fell out as she moved. Another mysterious card.
Having passed the test of the consequence clause, the associated magic is condensed into an article of clothing, allowing to retake the form in question under conditions of arousal. Enjoy safely, and do not mix magic articles and share at your own risk.
Ava read it to herself, and then aloud to Ethan, who was still looking stupefied at his tail. HIS tail.
“So, it seems it’s supposed to let me retake mermaid form later, in a slightly more controlled fashion… but apparently it works on you…”