"Why wait?" asked Lilia.
"But I'm still female!" protested Kevin. "And a mermaid."
"I'm not particular about that" said Lilia before pressing her lips to Kevin's again.
Kevin was surprised by that revelation, but wasn't going to protest. He returned Lilia's kiss, happy that in all the crazy events of this night the barriers between them were at least knocked down.
Lilia reached under Kevin's dress and pulled it off over her head. She ran her hands over the feminine body that had once been her boyfriend and was now a mermaid. Lilia squeezed Kevin's breasts sending unfamiliar, but pleasurable sensations through Kevin's body. Kevin began to unbutton Lilia's blouse, working slowly to savor the experience, but also due to a lack of familiar with her new hands. The blouse cast aside, Lilia removed her bra and then her skirt, leaving her naked on the couch as well.
"No panties?" said a surprised Kevin.
"I wouldn't want to shred if I were to unexpectedly transform" explained Lilia. "Now where were we?"
She pressed her lips again to Kevin's, while they caressed each others bodies. Then Lilia began to kiss her way down Kevin's body - first his neck then his breasts, teasing each one with her tongue. Then down her stomach to where skin became scales.
"Are you ready for this?" asked Lilia.
"Yes!" exclaimed Kevin.
Lilia's tongue found Kevin's womanhood, flooding Kevin with more unfamiliar but amazing sensations. But as Lilia began to pleasure Kevin she could feel a sensation stirring within her. Although she had only taken her serum a few hours earlier to prevent returning to her mermaid form, Lilia now was either craving her true form or on the verge of transforming anyway - she wasn't quite sure.