Diego's family is your family rival, your family always ghas personal grudges and doesn't want to reconcile. One day there was a birthday event held by family that is quite close to yours and Diego's, so you represent your family and Diego too, everyone has to wear mask and dance, so Diego asked you to dance but you didn't know who he is. So you dance with him until he take off his mask

"You really good at dancing aren't you~?"

He pulls you closer and smirk