So I lost a bet to a friend and he wants me to write this fanfic. Warning! There will be loudcest in this story! (Don't worry I will make them not actual blood siblings, my friend never said that is not allowed.) What if Lincoln, after a fight with his family where he learned a terrible secret, disappeard? Years later he returned but he changed quite a lot. It's (Not) Your Fault AU (A bit inspired by a fanfic called "Loud Thunder" by GDW311 on Fanfiction.net)

Eleven-year-old Lincoln Loud receives a mysterious letter one day, inviting him to visit a toy factory called Playtime Co. At first, the invitation seems like a simple curiosity, but there's something about it that feels different-almost as if it was meant for him. Intrigued and unable to shake the feeling that this could be something important, Lincoln decides to make his way to the factory, eager to uncover the secrets behind the strange letter. When Lincoln arrives at Playtime Co., he's stunned to find the once-bustling factory now abandoned, its walls crumbling, and its windows shattered. It's eerily quiet, and the air feels heavy with neglect. But Lincoln's not one to back down easily. He knows he didn't come all this way for nothing. Determined, he searches for a way in, eventually finding a broken door that creaks open as he steps inside. Once inside, Lincoln is struck by the strange atmosphere that permeates the factory. The rooms, once filled with joy and laughter, are now dark, dusty, and cold. But as he ventures deeper, he begins to notice strange, unsettling details-old, forgotten toys scattered across the floors, strange markings on the walls, and the faint sound of something moving in the distance. It becomes clear to him that there's much more to this place than meets the eye. The factory is far from abandoned-it feels alive in a way that's almost impossible to explain. As Lincoln continues through the factory, he uncovers secret rooms, hidden corridors, and clues that suggest Playtime Co. was not just a place for creating toys. There's something far darker at play here-something dangerous, something that's tied to his arrival. With every step, Lincoln starts to piece together the puzzle, realizing that he wasn't just chosen to visit this place by chance. His arrival is no accident. There's a deeper reason he's been brought here, and it involves a life-risking challenge that could change everything he knows about the world and his past.

Now an adult, Lincoln Loud begins a new chapter of his life by moving out of his childhood home and living on his own for the first time. Independence isn't as freeing as he imagined. The silence of his small apartment is heavy, and the pressure of paying bills quickly forces him into an exhausting job search. One by one, he turns down positions that feel meaningless or poorly suited to him. Eventually, Lincoln comes across an opening at a local restaurant known as Freddy Fazbear's Pizzeria. Marketed as a family-friendly place filled with animatronics and nostalgia, it seems like a stable opportunity. Hoping for responsibility and better pay, Lincoln applies for a management role. Instead, he's offered a position as the night security guard. With few options left, he accepts. From his very first night, things feel off. Cameras flicker without warning, mechanical footsteps echo through empty halls, and the animatronics seem to move when no one is watching. During these late shifts, Lincoln meets Sunset Shimmer, a confident and perceptive girl who often stays late at the pizzeria with her group of friends. What begins as casual company during lonely nights grows into genuine trust. That sense of comfort doesn't last long. As Lincoln and the group spend more time together, they uncover disturbing clues-old reports, locked files, and rumors tied to Fazbear Entertainment's hidden past. The pizzeria isn't just hiding secrets; it's alive with them. The animatronics aren't malfunctioning-they're aware. Once the doors lock and the lights dim, Freddy Fazbear's Pizzeria becomes a nightmare. Trapped inside with something hunting them from the shadows, Lincoln, Sunset, and her friends must work together to survive the night and uncover the truth Fazbear's company tried to bury. Because when morning comes, not everyone is meant to leave.