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

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

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