Disclaimer: I do not own H2O or any of its Characters

After their parents left the girls turn to their guardians who had stayed behind.

"So what happens now?" Rikki asked curiously.

"Nothing. We can not force you to return home. You are essentially our superiors and we must obey your command."

"Okay, so what do we do now? I mean it's still a few minutes til moonrise are we ready for this?"

"Actually a swim is in order," Lyra, Cleo's guardian said with a grin for she knew what this full moon would bring.

"Wait. What?!" the eight of them said in shock.

"Oh no, there is no way they are going out there tonight. We have had just about enough of moonstruck mermaids," Will stated stepping in front of Bella protectively.

"But it is the only way they will receive their full power. This full moon will grant them that."

Lewis who had been on the receiving end of a new mermaid power was very hesitant to allow them to go. "So they wont be moonstruck tonight? How?" he asked, his scientific brain trying to understand how it would be possible.

The four guardians smiled at him ignoring his question before shaking their heads. "No, tonight they will not be effected by the moon. Every mer gains their full power sometime during their eighteenth year."

"Is that how our grandparents found out that our parents didn't have the power of an Elemental?" Emma asked.

"Yes," they answered.

"But how did they find out?" the girls asked confused.

"You will see if you go to the pool tonight," was all the information the older mermaids would give.

The guys looked at each other then at the four guardians. Each was wondering the same thing. How could they possibly know that the girls would not be effected by the moon.

Zane finally voiced the thought aloud. "But you yourselves said that the full moon effects them even though they are natural born mermaids which is unusual according to you. So how can you tell us they won't be effected by this full moon?"

"Can you not just accept that we know without questions?"

"No," came the four couples collective answer.

The four older mermaids tried not to smirk at the answer. It was almost as if they had known what their answer would be to their question. The four girls on the other hand looked at each other wondering if they should go to the Moon Pool or not. They were curious as too what other powers they would receive but they were also wary of going. Besides that the pool had seemed to lose its power because of the explosion and it had yet to gain it back. They each wondered if the cavern had somehow healed itself since they had seen it that afternoon.

"If we go to the pool, and we're aren't saying we will, how do you know that it will work? The pool has lost it's power. We would know since two moons ago we pulled the boys in with us and nothing happened to them," Bella, Rikki and Cleo said together.

The guardian smiled and decided to tell the girls their little secret. "That is because right before we showed up tonight we went to the cave and we healed the pool as it had indeed lost its magic."

The four couples could only stare at the four guardians in shock. They couldn't believe that their sanctuary had actually been healed and the girls were anxious to see if it were true. Before the young men could stop them the four girls ran out into the night, too late realizing their mistake. The elder mermaids had been wrong just as the boys had feared. Before them stood four moonstruck mermaids. The girls turned to the boys with a smile and then ran for the water diving in and then after changing quickly making their way to the Moon Pool. The boys looked at each other then ran for their respective boats to go after the girls.

The guardians were shocked. The girls were not supposed to have been effected by the moon that night. They all wondered if their seer had been wrong on that account seeing as how they had become moonstruck when they were not supposed to. Shrugging they too made their way to the Moon Pool though they stayed back and didn't enter the pool while the girls were in there knowing that they needed privacy.

Lewis, Zane, Will and Ash followed their girlfriends to Mako. Once there they pulled their boats onto the shore and made their way the pool. When they entered they were awestruck by what they saw. The mermaids had been right about at least one thing; they had healed the cavern. It looked the way it had before it had been destroyed. They found their girlfriends sitting in the sand beside the pool each still in mermaid form even though they appeared to be completely dry, which normally would have changed them back to their human form, but what really got their attention was the fact that the girls entire forms were changing right before their eyes.

The girls who had arrived a good ten minuted before the boys had made it to the pool just as the moon was coming overhead. They had experienced the magic of the pool once more as the water bubbled and sparkled above their heads. When it was over they pulled themselves out of the pool and Rikki had used her powered to dry them off only to find that they weren't changing back to their human selves. There was a slight moment of panic in each of their faces before they remembered their guardians had said that they might not change back until the moon set. They heard the boys enter the cavern but they were too distracted by what was happening to their tails to pay them any mind. Their tails were flickering from the golden orange that they were used too to different colors.

"Uh, not to alarm you but what exactly is happening right now?" Will asked awestruck by what he was witnessing.

"We don't know," the girls whispered together still staring at their tails in wonder.

The guardians who had held back to give the girls some space had telepathically contacted the girls parents asking them for information. They revealed that the girls had become moonstruck even though they had been told that they wouldn't be and that the girls had pulled the boys into the pool with them two months prior when the pool had lost its power and they wanted to know if the girls transformation that night would somehow trigger the boys own transformations as well. They were told that nothing about the girls seemed to follow the rules that guided the mer and that anything involving them was possible.

Back inside the cavern the boys, who had been more focused on the girls than on the moon overhead, walked over to their respective girl. Moving to sit beside them hesitantly, each knowing that they could easily be pushed into the pool.

"Are you girls alright?" Lewis asked concern lacing his voice as he put an arm around Cleo.

Before the girls could answer him their tails finished flickering and their colors were now different for each girl. Emma's tail had turned nearly white except now her back fin and tail fin were now a light icy blue. Cleo's had turned royal blue with lavender back and tail fins. Rikki's tail had turned a deep red with orange and yellow swirls throughout; her back and tail fins had turned a pale yellow. Bella's tail had turned a pale green with aquamarine back and tail fins. Each of the girls hair had also seemed to lengthen to their waists each with a hint of their tail fin color highlighting it. Their tops had also changed. Where before it had been a halter-top it was now strapless and the color of their respective tails.

The boys looked at their girls in awe and then before they knew what was happening they had each been unexpectedly pushed into the pool. When they surfaced they saw that the pool had once more begun to bubble they tried to scramble out of the pool but even as they tried the pool seemed to pool them back in. They each begged the girls to help them but one look at the girls and they saw that their faces were looking up at the moon which was still overhead. They each knew that they were not going to be the same once they got out of the pool. When the pool stopped bubbling they quickly exited the pool, each glared at his girl. Before they could say anything though the girls changed back to their human form but unlike the times before they each fainted. Alarmed by this changed the boys rushed over to the girls pulling each of them into their arms.

The guardians sensing that something was not right swam into the Moon Pool. Seeing their charges passed out in the arms of their respective mates they hurriedly pulled themselves out of the pool changing back as soon as the were out of the water. The each went to their charge laying their hands on them and began chanting in their native tongue. Moments later the girls awoke confused as how they had gotten to the moon pool when they had just been at the cafe. It was then they realized that the boys were soaking wet and were holding them but they were not changing back into a mermaid. The each looked at each other and then at their guardians clearly wanting and explanation.

"We can't answer your questions right now. We are as confused as you are by this turn of events," the guardians said in unison.

Just then the boys felt a tingling and before they could say anything each of them transformed.

The girls could only stare and then began to apologize profusely instinctively knowing that they had caused this change in their boyfriends. The guys tried to reassure the girls that it was okay but they kept apologizing over and over again.

"Hey, Cleo don't cry. We were told it would happen sooner or later; preferably later but I'm okay with it really," Lewis said pulling Cleo awkwardly into his arms.

The other girls were shocked that the boys were so accepting of their new tails but what shocked the girls the most was the fact that the boys tails almost matched theirs. Whereas theirs were two or three toned (in Rikki's case), the boys' were solid colored. Ash's tail was completely ice blue, Zane's was a solid red, Will's was aquamarine and Lewis's was a medium blue. Though unlike the girls they did not posses the highlights in their hair.

The change in the boys made the four older mermaids wonder what else was going to change. True they had told them that the girls mates were human and that once they had mated the boys would change permanently to mer but they had not foreseen the boys becoming mer before that moment in time. As they had already been told that nothing went according to plan when it came to the four mer princesses they shrugged it off simply accepting that what happened happened and they would leave it at that.