Tell him what happened
From Create Your Own Story
"Your mom sent me to the pound and I escaped when they tried to kill me", you reply.
"Okay", he says, carrying you home.
"Wait a minute!", you both say simultaneously.
"Did you just talk?", he asks.
"Oh yeah", you say, "apparently I speak English now...it's okay, I won't tell anyone". Then you...
Let him take you home (that's basically it).