You and Sero were really close friends since his time at UA, he was a hero, and you were a doctor at UA, he was half hispanic, and knew some Spanish. For a while, he had a small crush on you, until it started to grow, so one day, you two were both hanging out, when he decided to "tease" you, but he really wanted to confess to you, he loved you... "Mordiendo mis labios verás, Que nadie más está en mi camino, Nada tiene por qué importar, Déjalo atrás, estás conmigo." Sero said, a blush on his face, he thought you didn't know Spanish...but... You did. You just heard your best friend confess to you.