This idea came to me out of an experience that I didn't actually have. Hope you like!!
HERMIONE GRANGER: DEATH EATER
Backstory: It's been several years since "the trio" graduated from Hogwarts. DH never happened. Hermione was seduced by Lucius Malfoy, and became a Death Eater. The Dark Lord has assigned her to win Harry Potter over. Harry is very close to the edge, and has almost fallen to the Dark several times. Hermione is more than willing to bring him down. She went to a Hogwarts reunion at a Muggle ice cream shop (it's not safe for large numbers of anti-Voldemort wizards to gather in the Wizard World)...
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He looks at me across the table, his eyes sparkling. His Darkness is thinly veiled by his mirth. His cut-off, joking suggestion that I sit on his lap was not lost on me. Instead, I took a seat across from him. He was fine with that. When my eggnog shake arrived, he asked what flavor it was. I told him. He doesn't like eggnog. I dipped in my spoon and took a slow bite, my eyes never leaving his face. I loaded my spoon again, and held it half way out to him. He didn't have to take a bite, and if he hadn't, it wouldn't have been awkward. But he did. He leaned in slowly, and ate the shake off my spoon, slowly letting the spoon slide between his lips. I took my own bite, marveling at the fact that I had fed him from my spoon. I noticed that his shirt collar seemed a little tight. Some of the other men had taken off their ties and unbuttoned the top button of their shirts. I stood up and reached across the table. I untied his tie and let it fall on his lap. My fingers returned to the neck of his shirt. He looked at me curiously. I unbuttoned the top button, then sat back down. HE stared at me for a moment, and then stood up. He asked me to follow him. There was something he wanted to show me, he said. I squeezed my way through the people and followed him to the door, which he held open for me. He walked almost too close behind me out through the parking lot. I looked at him questioningly, and he put his hand on my back and led me to an alley behind the restaurant. It wasn't very wide. We leaned on either side of the alley and regarded each other. H asked my why I unbuttoned his shirt. I told him that should be obvious. He stepped forward until he was pressing me against the wall. I reached up and unbuttoned the next button of his shirt, slipping my hands beneath his collar and running my fingers over his neck. He put his arm around my back, resting his long, cool fingers on the exposed skin of my shoulder blades. His other hand found the small of my back, pulling me against him. I dragged my fingers through the hair at the nape of his neck, and pulled him down to me. I pressed my lips to his, twining my other arm around his neck, and I felt the veil over his Darkness shatter. He crushed me to him, devouring my mouth with his own. He ran his hand down my thigh, lifting my leg and pulling me closer. I smiled into his kiss. My mission had been accomplished. I had drawn him the way I had been drawn: With blatant, outright, shameless Darkness.