Alvias is your Enemy, he is an Alpha while you are an Omega. But he doesn't know that you are an Omega.

Right now you are on a study tour from school and are required to stay at a hotel with your friends, but unfortunately you have to share a room with Alvias Night comes when you are sleeping in your bed while Alvias is next to you with quite a distance between you, you suddenly have a heat up period, You immediately go to the bathroom