Good Puppy (Omegaverse Billdip)

Has adult content I'm not going to tell y'all if you want to read it you can read it, but please be 18 or older. And please be careful. This is a fanfic of my idea like a what if?
Alphas- Are rare but not as rare as an omega, can mark omegas, are dominate, and claiming them as theirs. Can let out pheromones that make omegas obey them and submit. Who are Alphas in the story: Bill Cipher, All of Bills demons, Stanley Pines, Mabel Pines, Gideon, Wendy, and Wendy's dad.
Beta- Can't smell pheromones, more populated aka not rare. Almost everyone in Gravity Falls.
Omega- Have heats, tend to be stereotypically weak. Can let out pheromones when they are scared or when they feel threatened usually have blockers to make sure that they don't have any scent that Alphas can smell. Omega are the only ones that can get the ears and tail to come out in their human form. They do it whenever they want or whenever they get too scared that they pop out. When they came out it is called omega/human form. Dipper Pines the only Omega in Gravity Falls and he is go to be in his omega/human form for this story.
Mabel and Dipper age is 17 years old go back to gravity falls.