Soon, the serum's victim started to glow. A a wire made of light grew out of Andy's glowing, until it connected with his old bracelet. When Lilia singing finally stooped, the glow receded, revealing Andy's fate.
What Lilia, still clutching Andy's bracelet, hadn't realized, was that said object took some things from her, using it to save her beloved. The former human was now a sexy, albeit very tomboyish, mermaid. Slowly opening her eyes, she looked at her rescuer, asking "Lilia? Is that you?!?"
Before hearing those words, the former mermaid hadn't realized how different her body felt. She Looked herself, only to discover ‘she’ was a man now, albeit one a bit effeminate. But somehow, being male and human felt just as right as being a woman used to.
Looking at Andy again, Lilia blushed so much his entire face turned crimson, thinking Andy was even sexier as a mermaid.
His excitement didn't go unnoticed, his erection quite obvious in his far to tight pants. "Like what you see?" teased Andy, flicking her tail.
While Andy acted like she was totally unphased by the change, her body betrayed her true feelings, with her erected nipples and a face matching her lover's one in color. She too, felt as good in her new body, if not better, than she used to in her old one, but as eager she was to take it to a ‘test drive’, she wasn't feeling ready yet. "Can I have my bracelet back, please?" Andy asked.
The instant Lilia clasped it on her wrist, Andy's tail became two womanly shaped legs. "Oh, legs…" they simultaneously said, both sounding dejected, while the disguised mermaid tested them.
Lilia was about to take the cursed thing back, but his lover stopped her and focused on trying to change her legs back without removing the memento of her grandfather. Her boyfriend looked awestruck at the sexy legs becoming an even sexier (to him, at least) fish-tail.
Then, he threw out his ill fitting garments and joined his love on the bed. Too exhausted to think about how they will explain their changes to their respective family or choosing new names, let alone about doing sex, they simply snuggled together, falling asleep.