"Well," she says slowly, "let's see how well Brooke's technique really works..."
"No, please," you beg, "we'll all regret this!" However, your cock gets very hard as you think about it...
"When your penis gets all hard and starts to drip that pre-cum stuff, does that mean you're excited?"
You try to shake your head, but she puts one hand on your heart and one on your cock. Your cock twitches and your heart races as she very gently caresses your cock.
She whispers hotly in your ear: "You don't have to answer, I can tell you are really excited by how fast your heart is beating..."