Hey, just a randon writer who felt interested in the Five Nights At Freddy's UNC(Ultimate Custom Nights) as seeing the Vengeful Spirit, Old Man Consequences, and William Afton. So for that I put in a what if Cassidy have a brother who somehow got entrapped by her torturous game because of revenge and anger.

Also not bring confusion to the story, Leon is gonna be changed to William Afton who have to get tokens, find easter eggs within the game to show what he really is.

Will he fail, will he succeed, or in someway the story itself gonna have twist and turns of ending you want and don't want?

Let's find out.

Chapter 1: A Birthday with a Heavy Price

It was the year 1983 and being Cassidy's 7th birthday with her favorite restaurant called Freddy Fazbear's Pizza. The building itself was packed with children and parents there supervising as a lot were waiting to see Fredbear perform on stage with Golden Bonnie playing hide n' seek with other children. Cassidy herself was with her big brother who is called Leon, a tall athletic young man who hold his sister dear to his heart. Ever since she was born he vows to protect her no matter where she is and what is the situation, until then there bond was left unmatched with their father and mother looking at them, laughing at their pride and joy playing together in the arcade games before Cassidy's big birthday cake party starts.

Leon who is 14 right now is with Cassidy at the fishing game, trying to go for a bear pocket patch which she was rooting for her brother. "Get it big brother, I know you can do it!" She yelled as Leon trying not to laugh and trying to focus on the timing of the fishing rod.

"Shhhh… hold on, you know this takes time you know sis, even if you just a 'shorty'." He said teasingly, sheepishly laughing while Cassidy pouts at him. Since the following past years, Leon always teasing his young sister by using short word like shorty, small fry, and little girl.

"Awww no fair Leon, one day I will get tall as you… you big meanie." She looked away at him while lightly blushing and puffing her cheeks out, it was no fair that he was the tallest one in the family, every wish she made in her birthday ever since she hit 5 was 'I wished I was tall as my brother'. That made him laugh but yet smiled wholeheartedly at Cassidy.

"You sure will Cassidy, you sure will and can't wait for that growth spurt when you hit my age." He said, digging his hand lightly in her black long hair as she try to stop him, laughing as Leon knows she ticklish then suddenly…. Crank…

Leon accidently hit the button to snag an item with the fishing rod. He immediately looked back and surprisingly it was the bunny pouch his sister was egging him on about. You can see Cassidy's eyes and expression as if her eyes had the animations of stars popping out of her eye sockets while jumping up and down. Leon was a different story as he knew that even if he grabbed the pouch on sheer blind luck, the moral of the story with game machine is 'these things can be rigged'.

"Yay! Leon you got-" She was cut off by her brother who was making a sweat appear on the side of his face. Now that he got the pouch, he want to confirm that he actually got by making sure the rod doesn't drop it and it's back to square one again, he was down to this last token as he wasted 20 on arcade games, 7 especially on this game machine on top of it. "Come on baby….. don't drop." He silently said as the expense was killing him as this made him imagine being the player to take the last shot for the game win and the finally…. a thud was made within the machine and it was confirm. He got it.

Cassidy was hugging her brother from behind and screaming he did it with him digging his hand inside the game and looked at the pouch. The pouch has a bear on it, the bear being Fredbear who is Cassidy's favorite animatronic within the restaurant. It looked custom-made which surprised Leon but yet gives it to his sister Cassidy like a birthday present. "For my birthday sister Cassidy." He said, smiling at her expression since she would spend most of her tokens to get that exact pouch every chance she was here.

"Thank you big brother, ooooooohhh….. it's so worth it! I love it!" She shouted, jumping up and down with her looking at the Fredbear pouch, then goes to hug her brother, who grunted and just hug back. "Thank you so much, you're the best ever." Hugging him tight while saying those words, she knows he have to leave eventually but wants to make him stay here a little longer.

"You're welcome sis, anytime I'll be there." He told her back. He sighed then noticing a big shadow coming towards them, the silhouette was like a bunny. As he turned back, it was just the man who was Golden Bonnie. Leon know the man as he was William Afton, usually they have small talks and conversations when he grew, also knowing Michael and there younger child growing up call Timothy, but something just never clicked when he's around William for some odd reason like something…. changed but couldn't get a look at it.

"Hey, it's your pal Golden Bonnie! So is this the birthday girl?" William happily said with his British accent being very noticeable while bending down and looking at Cassidy who is clutching her brand new Fredbear pouch. "Yep, that's me Golden Bonnie! Anywho, when is the show and the ultimate hide n' seek will start? I want this to be the best birthday ever!" Cassidy said with a laugh after, feel with joy and excitement, eager for the show to go on and let it be embedded in every children and parent's mind that she had the best birthday and the best brother. Leon analyzing Golden Bonnie while chuckling a bit, from his stand point, he was like at the chest of the spring suit. Tall but yet not there, but that's another case for anything he feel suspicious about William's character.

"Well the show and the 'Big Finale' is gonna start within an hour and 30 minutes young girl, but in all enjoy the Freddy Fazbear's Pizza and our motto… 'This is a place for kids and grown-ups alike, where fantasy and fun comes to life~~' He stated while doing the jazz hands in a silly like pose which made Cassidy laughed and Leon trying to suppressed his laughter as you can hear his giggles. "And don't worry birthday girl, this is gonna be the most special day of your life!" Those words alone just spiral within Leon's mind, it made his eyes twitched and have him stop his giggles. This day is gonna be her special day, with him not around and playing a game which is gonna solidify his statement of being an elite. All he hear are but, buts, buts, buts, buts with the words spewing back with the sentence William Afton said, stiffened as a board with anxiety grasping at his throat, he want to stay but doesn't want to let his team and coach down, then he want to go to prepare for his big game but worrying about what's gonna happen to Cassidy while he's not here. Think, think, think, THINK!

Then a tug snapped him out of his thoughts as his sister and Golden Bonnie were staring at him with confusion, his sister having concern for him. "Big brother?" She said with a worried expression. He blinking and then shake his head and laughed awkwardly. "Hahaha, sorry, sorry, I zoned out a bit, it's nothing sis." He said, lying but don't want to make her feel like this is gonna be a bad idea. Cassidy looked at him, tilted her head as if her brother got a screw loose in his brain. "Well alright then, but hey, let's continue to have fun!"

She shrugged his actions off and dragged him out the arcade and into another place while Golden Bonnie looked at the two going together, under that suit was a wicked smile that would fire off red flags of Leon. Leon and Cassidy continued to play arcade games and play hide n' seek, red light and green light, any games they can muster well in Cassidy's case to make sure Leon forget the game and stay here at the restaurant. Not because of he's her favorite brother and him being more fun than her parents and other children, because she feels like with him around she feel protected with his aura. Her brother was like a knight to her life and doesn't want to let go, without him, she doesn't know what possibilities of getting kidnapped, bullied, or worse. Leon was like an idol to her and like a shield that couldn't be broken. Their parents know he clingy she was with Leon around, from the time she was born to now.

An hour passed by and Leon looked at the time, he sit down with Cassidy, mom and dad at the table. He just sighed and get up, hearing a car blowing outside which was the coach of the high school basketball team ready to pick him up. The coach parked and actually came inside to see the family. He was a former neighbor until he left when home settlements didn't come full circle with repairs, still he always stay hard on Leon and come to family dinner to talk about Leon's potential as a future basketball player in his future. The coach at the table and seeing Cassidy the birthday girl with her usual warming smile. "Cassidy, someday that smile will make me win a lottery before I die." He jokingly said. "Boy you tell me and I'll still lose, but how you been?" The father stated while all of them were getting a good laugh in with the coach and dad shaking hands.

"Good, good, just gonna pick up your son and go to the biggest day of his career. If the man average 30 points, 5, rebounds, and 9 assists throughout his whole high school career, the boy is gonna be a damn stud! Oop my bad, excitement came out." He shouted but quietly apologized as he have to remember to not make a scene in this filled restaurant. "It's all good Dennis, hey Leon, you're ready?" His mother smiled while asking Leon, but all that was turned with the coach, dad, and mom looking at Leon staring at Cassidy and Cassidy staring at Leon as if they don't want to leave one another. "Hey Leon, don't worry. Our daughter is gonna be safe in our hands." The mom putting a hand on Leon's shoulder. "Yeah, buddy. This is her biggest day, and your biggest day is at the game, we can take care of her. And besides, she's gonna be quote on quote a 'big girl'." The father said and putting his hand on Leon's other shoulder. Cassidy still looking at him then Leon spoke. "I know….. but, but I-"

"Hey Leon, we all been there. It's not like something is terrible gonna happen on this special day of our sweet girl here." There it is again, the special day with the Golden Bonnie said earlier, sure it is gonna be special day for Cassidy but Leon sees it different then her being safe….. maybe, maybe he just having an odd day as the finals of the high school basketball game is now here. Yeah, he just getting nervous that's all. "Well you are my and her parents, gave birth to us so… I'll have to trust my own parents since you're our guardian" He took a deep breath and finally relax a bit. Both the parents and the coach nod as the coach was leaving to his car. "Kid, I'll be in the car, wanna give you some final words before we leave and go to the dome." Coach stated while leaving the place. Leon felt he feel fine with Cassidy is with mom and dad. "Well I have none, so I'll say bye. Take care all of you!" Leon said while walking to the door with the parents waving back.

Walking and smiling lightly as he leave Freddy Fazbear's Pizza, something grabbed his arm, a familiar warm hand. He looked back and see Cassidy with a sadden, worried expression. Her expression alone was putting him in a literal dilemma because she's his sister, but what about the game? "Big brother….." She said in a soft tone, the Fredbear pouch in her other hand as she looked at him with her big eyes, it was soul-tearing for him to see his sister look like this. "C-can you…. stay here…. for me please, I-…I want to feel…. Comfortable here." Stammering on her question because her protector and big brother is leaving her alone. She feel like nothing can stop her with him around, but when he's gone, it's like she frail, fragile, and scared of anything that's gonna get her. "This is just a favor…. can you-" Her question was interrupted by Leon hugging her.

"Cassidy, I know I usually call you short and stuff like that, but let's say it's….. your turn to be big." Leon said to give his little sister confidence with him not there. "You know mom and dad going to watch you with big brother is not here, but I want this favor, can you be a big sis for me?" He smiled softly at her, her expression yet unchanged but seeing that smile of his she nodded lightly. "Mhm, I will be big since it's my birthday." She said, he felt a little confidence in her, maybe that's all she need like he needed from his coach, mom and dad. "Good, but don't worry, big brother is coming back in two days, two days. You think you can be a big sis, not only to our parents but to the other children?" He asked, now her expression changed a little with a more confident nod. "Mhmm, I will, two days! And in those two days we gonna have much fun when you win!"

"That's the sis I know." All his doubts and what-ifs were washed away from her statement, rubbing his hand in her hair again while chuckling. Now that the decision is settled, his coach politely waiting in the car. "Those two are so close to one another, man no one couldn't ask for a good brother like him Cassidy, no one." He said to himself while Leon got in the car with his coach as he drove off. Cassidy standing outside the diner waving at her brother while he waved back. "Bye big brother! I'm keeping your promise, two days!" She yelled. "Two days sis, I'll come back as champion!"

Both saying there goodbye as he was gone, the confidence instilled in the little girl Cassidy as she huffed and sighed. "Ok, now it's big sis time. Big brother told I can be big sister." Talking to herself with Golden Bonnie was looking for her. "Birthday girl! This is where you been? The show is about to start!"

"Oh no! I can't forget the Freddy Fazbear's Show, I'm coming!" She yelled and darted back into the diner, laughing. Golden Bonnie sees the car going further and further away. Leon looked back and see the bunny there, staring at the car. This was giving him shivers that went down his spine. "Hey buddy you're ok?" Asked the coach, his best player was on edge ever since he seen him, usually he be ready to work and eager. "Oh! Yeah! Yeah…. just…..having some thoughts and a question."

"Coach, ….. am I making the right decision?" Leon said, looking at the coach with wavering and doubtful look on his face. Coach really don't know what it's like to be in Leon's shoes to have a sister who she cherish in her life, but he have to give him an answer to make him stop worrying. "Son, sometimes it's ok to have decisions like those, it makes us human. I know your sister is like the world to you as she thinking you're are the world to her. Two big days are separate from one another, but I know this. Even though you away from her and it's a bummer, maybe it a case of hers she might now a thing or two from her birthday about growing up. Like you challenge her, can challenge yourself to say- 'Hey, my sister is the best sister I ever had, but somewhere in her body there's a woman inside her that can't be quiver.' and tell yourself she gonna be just fine without you?" The coach asked, hoping that what he said could be the catalyst to Leon's doubts.

Leon thought hard and deep for this, yeah sure he and his sister were so close to one another. He felt like she was a lucky charm every moment he play his favorite sport. Somewhere in life he have to let go and give her independent wings. It's her birthday like she said and nothing could go wrong. "You're right… this is a challenge for her and myself. We always be with each other. Maybe it's time to see how we are separate." Leon said and nodding to the coach. "That's my boy, now when get to the dome. We gonna do light training and we're winning that title!"

"Yes sir!" Both yelling the team name while going into the city, meanwhile… Golden Bonnie have other plans. This special day was going to be special day, just excluding the fantasy and fun. The special day was how many kids he could get his hands on and put into suits. "This is gonna be a fun, fun day. Bye star, because you're not gonna see tomorrow as you see today." William Afton laughing within the suit as he goes back in, the show is about to start with the stage is set. A decision that will one day change the life of both Cassidy and Leon.

Alright, one chapter down. More to go as this dreaded day will turn the young man life upside down.

Anywho, hopefully this goes well. See ya :)