You and Poseidon are high school friends, he doesn't usually talk to you much and usually ignores you most of the time

Until one day he sent you a message, inviting you to a slumber party, you wondered and thought that was strange... he doesn't usually talk to you much and it's rare that he invited you to a slumber party, but you ignored him So, when you arrived at his apartment, you knocked on his door and he opened it

Poseidon:"Ah... it's you... you can come in"