She became slightly frightened, but excited as well and another third feeling she could feel; unresistable urge to return to the pool. She stood onto her still numb legs and with uncertain steps she got back into the pool. She didn't stop, until the water reached her neck.
"Tessa, no! Come out, it's maybe dangerous!" Said Craig concerned.
"No, it isn't It's calling me..." She answered with an odd tone and smiled toward his boyfriend. As if she had been fallen under some kind of influence or hypnosis.
"Please, Tessa..." Begged her boyfriend.
"No need to worry..."
She smiled one las time and then submerged completely beneath the water.
Knowing that his girlfriend is an excellent swimmer, he tried to control himself and don't panic.
Seconds passsed... one minute... two minutes...
After almost three minutes of waiting he was ready to jump into the pool, his girlfriend slowly popped out her head from the water.
"Tessa! Are you alright?"
"I am. In fact, I never felt better." She said still with strange voice, deeper from usual.
As her body started slowly emerging from the water, Craig noticed that she has changed. Her skin became brighter, her hair was longer, smoother, brighter as well. It covered partially her breasts, which seemed now bit larger, shapelier. She had become indeed much more beautiful.
She swam closer to the shore, lying on her stomach, supporting herself with her arms. Behind her something was fluorescing beneath the water. During all this time she kept her eyes fixed on Craig, Her new form mesmerized him.
"Are you sure..."
He couldn't end the sentence, because behind Tessa's back now emerged something from the water, he doesn't expected.
A mermaid tail.
A beautiful, smooth, greyis green mermaid tail, which glistened beatifully in the moonlight.
"Whoa..." Craig dropped his mouth.
Tessa just chuckled at him, then swung with her tail and retreated into the deeper water.
"Why don't you dip yourself?" She asked.
"I..." The trance is now weakened and Craig became confused.
"Come on! Hear the calling fo the water, like I did and join me...!"