Push for it

"I am serious." Luke grabbed onto to Grace's arm to her small suprise. "It's only fair, Ms. Peach put me through the ringer this morning."

Grace's whole body slowly started to stiffened up as Luke spoke.

How on earth had this idea gotten into his head?

Yet, trying to keep her expression soft, Grace delivered her answer in a controlled tone which had lost all energy of mood.

"Luke, no. This is highly inappropriate what your asking for, now I want to do something nice for you, so pick something else."