Ask her what the extra credit is

She replies "Well, you might say its a bit....extra curricular...." "Sure," you reply "I'm ready for anything."

"Good, good." She moves towards you and grabs you crotch, massaging it lightly.
"Huh?!? What!?!" it startles you greatly. "Well I did say it was extra curricular, and you said you were ready for anything...But I'm not mean, what do you want me to do first?"