Oh. My god. Found this through ffpress, and WOW. This scenario works so well because of the beautiful characterization you present; Cecil's struggle against his own darkness and Rosa's knowledge of what Cecil truly is. I love the mention of how Rosa sometimes misses his dark side... and the ways in which you describe him surrendering to her is just perfect. Such an interesting power play... I love this... not to mention it's totally hot, of course. Well done. :]