Hold Steadfast

First of all, although you had some ideas in the back of your head about what that'd be like, there was no upside in bending to Sofia's will so quickly. Plus, this would not help with tutoring at all and would likely end up with you losing your job. Her parents had paid for you to tutor her, not service her.

You briskly responded "Sofia, you know that I am here to tutor you, and that does not include any sexual services."

"Fine, then tutor away if you think you can. I was making a joke anyways, not like I was serious" Sofia huffed, almost in an attempt to regain the upper hand she had lost as she didn't expect you to have any backbone.