The next day, when Musa woke up, she found that everything was enlarged; the bed was taller and the pillows seemed larger. "What happened to me?" Musa asked herself, and was caught by surprise that her own voice was a voice of a 12-year-old girl. She ran to the nearest mirror and true enough, she saw herself as a 12-year-old girl. No! Musa thought wildly. This couldn't be happening! I must be having a nightmare!" But this was no nightmare; Musa was a 12-year-old girl. Logan came back, with his tail extracted. He put his arms behind his head. "I missed my tail so much as a boy," he began. "Tail?" exclaimed Musa. She walked around and saw Logan's long, brown tail.
"Musa! Musa! Where are you?" called Stella. "Oh no, I must not let Stella find out that I'm a 12-year-old girl!" exclaimed Musa. Logan pulled Musa along with him to the Alfea library, "First, I have to let you understand seriousness of me having a tail."
"But –– Bloom and others will find out that I'm a 12-year-old girl!" exclaimed Musa. Stella heard the little girl's voice and was soon on their heels. "Quick, there is no time! My part is more urgent than yours," chided Logan. Musa sighed and followed him.
"Flying Nimbus!" Logan called, and Flying Nimbus came to them immediately, but its trail, however, unintentionally attracted Bloom and others. "There is a yellow streak here," remarked Bloom. "Let's see where it leads to." Now! Musa thought, this is the right time to enter his body! Musa hugged Logan's arm tightly and began to glow in with bright light. "Musa?" Logan called, with Musa turning transparent each moment. Logan's eyes widened, "Musa? Musa? What are you doing, Musa?" Suddenly, Logan felt a sharp pain as Musa gradually entered Logan's body and he yelled in agony as she pushed herself into Logan's body, "Ah~! Ahh~! Ahhh~! Ahaha~!" Bloom heard his yell, "Logan! Are you alright? Is there something going on there? I'm coming!" Musa spoke through him, "No, Bloom! Stay where you are! I'm fine over here!" Logan gave a final yell as Musa finally completed pushing herself into Logan's body, "Ah –––––––!" Musa, after entering Logan's body, felt extremely safe and peaceful, "Wow! I feel –– I feel so peaceful in here!" She called out, "Hey Logan!" Logan heard her voice in his head, "Where are you, Musa? Why am I hearing your voices?" Musa grinned and replied, "Because I am in you. Right now or forever, we're always together! Isn't that great?" Logan sighed and thought back, "Alright, Musa. You can do anything you want in me."
Logan rode the Flying Nimbus, now all by himself, to the library of Alfea. "Search for Saiyans," he commanded the books, and the relevant books magically flew towards Logan. "Tails," he commanded the relevant books, and the pages magically turned themselves to the relevant topic. Saiyans are a naturally aggressive warrior race originally from Planet Salad (and later Planet Vegeta, Logan read. "Wait! Planet Vegeta! The place where we went before! You told me that the planet we went was the new Planet Vegeta because it was destroyed by this villain Frieza," remarked Musa, in Logan's mind. Logan continued reading, "All Saiyans have a monkey-like tail that allows them to transform into Great Ape when they look at a full moon." Musa gasped in horror in Logan's mind. "The moon," Logan repeated, accidentally looked at the bright full moon that was still visible in the clear dawn sky. "The full moon!" Musa gasped, and not even her could stop the transformation. Logan's breathed faster and faster, so did his heartbeat. His eyes turned dark red, his body ripped off his clothes. His shoes became too small for him and he grew in size, bigger and bigger, crashing off the Alfea library until he was as huge as a mountain. Finally, he roared.
Musa released herself from Great Ape Logan since she could no longer control him anymore, not even his mind. "MAGIC WINX! SPEEDIX!" she yelled. Musa attempted to lose Great Ape Logan, but caught up before Musa had a chance to take a breath. Oh no, Musa thought. Logan is destroying the whole Alfea.
"Hey Icy, come look at this," Darcy called, observing the situation through the viewing orb. Icy joined her, "Well, it seems like we don't need to interfere at all! I am pretty sure we aren't even controlling it. Look, this monster is destroying Alfea!"
Moments later, the rest of the Winx, Ms. Faragonda and Ms. Griselda arrived at the scene. "Musa! What happened? Why are you " Bloom called. "Nightmare monster?" suggested Stella, noticing the huge, black monster behind Musa. Musa stopped them, as they were about to shoot at Great Ape Logan, "Don't harm him It's just the full moon!"
"Thank you, Musa! We just know what to do!" exclaimed Ms. Faragonda. She attempted to blast the moon, but the shot was not in range. "Allow me, Ms. Faragonda!" suggested Musa. "Hey Logan, I'm over here!" she called to Great Ape Logan, who shot a mouth energy wave at her. Musa dodged just in time and Great Ape Logan blasted the moon instead. He roared and finally reverted back to a naked 12-year-old Logan, fast asleep. "Awww, Logan looks so cute as a 12-year-old boy," giggled Bloom. "Especially with the tail," added Flora. Bloom carried the 12-year-old Logan in her arms to Alfea. "Hold on, Musa. Let me fix you first," said Ms. Faragonda, and she turned Musa back to her original self. "Thank you so much, Ms. Faragonda! I feel so much better!" piped Musa. The Specialists came to visit the Winx. "Since Logan is now a 12-year-old boy, you're mine, Musa," grinned Riven. Musa shook her head, "No, Riven. No matter how old he is, I will still love him, even when he is turned into a 12-year-old."