Help with homework

I asked Eileen for a hand with my math homework because all those square roots kept beating my brain up. She came right over but instead of scribbling on the worksheet her sneaky fingers dove beneath my skirt like it was a race. They brushed aside my panties and went hunting for that sopping, eager skin. A sneaky grin flickered on her lips, promising more mischief than derivatives. Her fingertips traced slow, teasing circles until I forgot every formula I thought I was studying.