Sally needed a break. So, Percy, like the good son that he is, offered to babysit Estelle for some time while Sally went to the spa for some relaxation.
At first, everything went smoothly. Estelle was a very happy, silent baby, and Percy knew how to feed babies and change diapers. He played with his sister for some time (he did this by making little water figures appear above her crib. Estelle always laughed happily when he did that). Then, it was time for Estelle's nap. She swiftly feel asleep. Percy got the babyphone and went downstairs to watch some television. There was not much, but he settled for the six thousandth broadcasting of The Sound Of Music (He would never tell anybody, but Percy was a pretty good singer and like The Sound Of Music a lot). He was just singing along to Edelweiss, when he heard a sound from his sisters' room. Not like a cry or a baby noise, but something else. It was like something glided across the room. Without hesitation, Percy grabbed Riptide and ran upstairs. In his Sisters' bedroom stood a slimy monster Percy had never seen before. He stabbed to monster, but that only made it angrier. So Percy grabbed his baby sister out of her crib and ran downstairs with her in his arms. Estelle started to cry, but Percy didn't listen. He ran out of the front door and down the street (his mother had taken the car to the spa). He didn't look behind him. He waved to a taxi, and told the man to drive him to Long Island, price didn't matter. The taximan gave full gas, and the car drove towards camp Half-Blood. Percy looked behind him, and saw the monster roaming around. He sunk down very low. 'Say, which cabin are you?' The taxi driver asked. Percy looked surprised. '3, actually. And you?' 'I am from cabin 9.' Percy gave him a weird look. 'Did you do something to the car we are currently driving in?' He asked the man with a suspicious tone in his voice. The man smirked. 'It can fly,' he said. Before Percy could answer to that, the car took of into the sky, and they were going way quicker to Long Island than ever before. Percy squealed. Estelle started to sob less violently, and eventually calmed down. Percy gave her her binky and she fell asleep again. 'Is she a demigod as well?' The taxi driver asked. Percy shook his head. 'No. Her name is Estelle - she is my half-sister on the mortal side.' The driver nodded. 'I see. And how did you suppose she was going to able to cross to border?' Percy bit his lip. 'Shoot. I hadn't thought of that. Ehm, maybe the energy field will let her through? She's only a baby...' 'let's hope so, because I plan on landing in Camp Half-Blood.' The car started to lose speed and flew closer to the ground. They landed in Camp Half-blood, while a few campers screamed and ran away. Percy got out of the taxi. 'Thanks for the ride. Ehm, I should have money somewhere in here...' the taxi driver waved his hands. 'It's okay. I'll talk to Chiron. It'll be fine.' 'Thanks!' Percy ran away, with his sisters in his arms. He sprinted towards the big house. 'Chiron! Chiron!' He screamed, as he walked inside. Chiron walked into the room. 'Yes, Percy? Weren't you taking care of your sister today?' 'There was a monster, and it wouldn't die! I had to bring Estelle to safety!' 'You brought a mortal baby into camp?' Chiron raised his eyebrows. 'Well, yes. I couldn't think of any other place that would be save beside from camp Half-blood. Chiron sighed. It's okay, Percy. Just contact your mother and she can stay here overnight. You'll just have to cook baby food yourself, is that fine? I'll make sure Mr. D and the rest of camp know about her.' Percy nodded. 'That's fine, Chiron. Thank you!' He walked out of the big house, and towards the Athena-cabin. He passed by a few Aphrodite girls, who all screeched and crowded around Estelle, cooing. 'Oh, she is so beautiful!' Lacy cooed. 'How old is she?' Another girl asked. 'She is seven months old, and her name is Estelle,' Percy said. After the cloud of Aphrodite children had vanished, Percy walked further to the Athena cabin, and showed his sister to Annabeth. 'Look, ann, this is Estelle!' Percy happily said. 'Oh, she's a adorable!' Annabeth said. Estelle smiled at her. Annabeth smiled back. A horn sounded, somewhere far away. Dinnertime. Annabeth and Percy walked towards the pavilion. On their way, they were stopped by Dionysus. 'So you really brought a mortal infant into camp and believe that's save?' He asked. Percy rolled his eyes. 'I couldn't think of any other place.' Estelle smiled at their camp director. Dionysus smiled back at her, which got him surprised looks from Annabeth and Percy. He looked back at the demigods, and said: 'she can stay for one day, not longer.' Than he walked of. Annabeth and Percy looked at each other and giggled. Then, they entered the pavilion, and everyone who was already there walked up to Percy and cooed over Estelle, even Clarisse. 'She has the same eyes as your mom, Percy,' Clarisse remarked. 'Thanks?' Percy said. He sat down at the Poseidon table. He still didn't know what the monsters was, but Estelle was safe. And that was the most important thing in the world to him.