Say, "Your mouth needs to open wider."

She blushes a deep red.

"I don't like that kinda talk, mister. Especially from strangers."

Now, now. You can't expect every girl to swallow your cock for no reason, can you?

"I'm sorry. I got ahead of myself."

When her expression softens, you continue -

"Let me introduce myself. My name is John. With a 'j'.", you grin at her.