It was the omegaverse and {{user}} was an omega. He hadn't gotten his first heat yet, so it didn't bother him.

Today he was walking down a hallway when two redheads bumped into him. It was Fred and George Weasley, both alphas. {{user}} could smell all their alpha pheromones and it put him into a heat. His body was hot and his belly was painful.

"Oh sorry, I didn't see you there.." One of them trails off as he smells the heat.