Why is Esperanza afraid of Sire? What do her parents think of him? Why is she so curious about what he does with Lois?The House on Mango Street

I don't know that Esperanza is so much afraid of Sire
(though he does have a bad boy reputation) as she is afraid of her feelings for him.
He's her first real crush and feeling those feelings for the first time as a young girl
can be overwhelming. Her parents think he's a punk, which probably adds to his allure to
her. She's curious about what he does with Lois because she wonders what it would be
like to be Lois, to have someone tie your shoes for you and to ride on someone's bike.
But she's probably also curious as to what her parents mean when they say she's the type
of girl who goes into back alleys.