JKR's characters are like bad medicine, producing dirty minded side-affects.
After-Hours Experiment
Uncovered
Hermione stood before the wall-length mirror, visibly nervous in over-large robes. A deep crimson flush suffused her face. There was no going back. The ebony wand removed the robes in a heartbeat. She let out an audible gasp. Pulling back her copious mane, she turned side to side studying her reflected image. Using magic she fixed her hair off her shoulders. Her smooth soft fingertips brushed down her neck and shoulders as gently as if from butterfly wings. Her lips bloomed pink. Touching the parted lips she ran her tongue across the front of her teeth. Slick and white, opening her mouth wide, she moaned deep and full.
Biting viciously on her full lower lip Hermione ran her hands over breasts cupping, caressing and rolling her nipples between her thumbs and index fingers. Eyes closed in ecstasy.
Her hands were on a direct course to her untrimmed dark curlies when she froze, falling back on to the floor. "Severus Snape, how dare you! How dare you!" Hermione walked over to the doppelgänger Hermione and kicked him hard in the ribs. "I hope that hurt. And I just came back because I had a brainstorm. It looks like my brainstorm rained on your parade. Like my body, do you?" Another kick to the ribs. Covering up the naked Polyjuiced man. "Well, I've got a bulletin for you, Severus, that's the only time you will ever see beneath my clothes."