From Day 1: Unos días (A few days)
¡Sube, sube!
¡Sube, sube! means “Come up, come up!”
Hear it in the conversation
Lucía
¡Marta! ¡Sube, sube!
Marta! Come up, come up!
Later, pasa, pasa means “Come in, come in.” Learn both as complete invitations; repeating them makes Lucía’s welcome sound warmer and more eager.