Sakuya teases Nagi explaining that she is so bratty that she can't take care of young children. Furious, she asks Hayate to go out and find her kids to take care of.
Don't make the sort of face 
that kids'll wanna copy.
No pongas una cara que 
querrán copiar los niños.
Não faça essa cara porque senão 
eles vão começar a te imitar.