The secrets between them gone, Lilia and Kevin spent the rest of the day and all of the night together as mermaids. It was difficult to get around Lila's apartment with tails, but they only dragged themselves around when they had to. Otherwise they spent the time physically together - blissfully spooning or exploring each other's bodies. They did eventually drag themselves to Lilia's bed rather than sleep all night on the floor.
In the morning, it was time to consider the things the lingering problems.
"I've been thinking about how to find Gisela, get my stuff back, and get me back to normal" said Kevin. "I can report my car stole. Then the police will help us catch Gisela."
"Doesn't she have your phone too?" suggested Lilia. "We could trying calling her and setting a trap?"
"Gisela wants to capture you for some reason. Maybe if you call her and offer to give yourself up? But I wonder why she's trying to catch you..."
"She's a real mermaid" noted Lilia. "So am I. It must be some kind of mer-politics. A faction that has it out for mers like me who chose to live with humans. Or maybe she wants to kidnap me and ransom me to my family."
"Whatever we do, we probably both need our legs" Kevin pointed out.
Lilia opened the drawer on her nightstand and pulled out a small vial. She drank a dose of her serum and waited. Nothing happened.
"Something's wrong. I should have started to get legs again. Triggering my transformation with sex might have had some consequences I didn't expect."
"The necklace is in the living room. That might allow you transform even if the serum doesn't."
"But what about you?"
"Lets see what happens when I drink your serum."
Lilia passed Kevin a vial and he downed it. Kevin gagged a little at the taste. He imagined that was what seaweed puree tasted like.