Kevin and Lilia spent the day together at Lilia's apartment, with her remaining in mermaid form. She hadn't spent this long in her true form since she came to the human world and quite enjoyed it. Kevin carried her around as needed, but mostly they spent the time close together: spooning in bed, cuddling on the couch, making love in the bathtub. They ended up spending a second night together and Kevin was again happy to wake up in bed with fish-tailed woman.
Over breakfast, they made plans for Lilia to meet at Kevin's home. Lilia wanted to come over that night, but Kevin begged off citing working. However, he pointed out this would give Lilia a chance to time her serum dose accordingly, depending on what kind of fun she wanted to have.
After a kiss goodbye, Kevin headed home with a plan forming in his mind. He called Gisela, apologized for being busy, but invited over to her place...on the same night as Lilia. Kevin wasn't sure what the two mermaids would think of each other - or him, when it became apparent what happened. But he doubted they would be willing to meet if he told them the truth, especially if he told them separately. So he would trick them into meeting instead.
Time flew by and soon the appointed hour was at hand. Kevin gave his freshly cleaned house one last look over when there was a knock on the door.