John immediately picked Emily up, his hands on her butt. Emily wrapped her legs and arms around John. They began kissing with wild, passionate lust. John carried Emily away from the dinning room to the bedroom. Caught up in the moment, Emily temporarily forgot about her whirlpool full of saltwater.
They fell on Emily's bed, still in a frenzy of kissing. The thought of the whirlpool briefly crossed Emily's mind, but she so desperately wanted to have John in her she didn't want to wait. Amidst the kissing, John's shirt was pulled off and they fumbled together to get Emily's pants then John's pants off.
Hands and lips were roaming everywhere and more foreplay would likely have ensued if Emily was not so desperately eager. "Fuck me!" she demanded.
John was more than willing. He entered and thrust home again again from his top posistion. The lovemaking was fast and furious, quickly reaching a crescendo and John exploded with Emily.
The moment the flood of semen exploded into her, Emily felt her legs begin to change. It was like an explosion of goosebumps, rushing from her groin down to her toes. The change was faster this time and felt different, like an impossible series of orgasms.
As John collapsed beside Emily in the bed, Emily rolled and twitched, hands rubbing all over her own body in excitement as she transformed again into a mermaid. As the changes finished, the orgasms stopped, but she could feel a little of the salty substance leak from her breasts again.
She was excited to have changed, but why had this happened? The saltwater whirlpool was waiting in her bathroom but she had changed from sex in her bed. Then she realized what had happened: the salty nature of semen had triggered her change as surely as regular saltwater would.
She hoped John would be even more excited for her new form and would have enough energy left for another round in the whirlpool. Then an idea occured to her: could John suckle her and be transformed as if he had drank the regular potion?