She knew he thought of her as more than just a student early on living in his house. Beyond the remark that he wouldn't force her into his bed, but she might find herself there of her own free will, she picked up the subtle hints and clues that he was leaving. Nothing would've made him more pleased than for them to forge a permanent alliance. They could have been the ultimate Death Eater power couple or whatever foolish term she'd heard a thousand years earlier when she was a young Muggle-born. Living under the same roof had its pitfalls. Long hours and close proximity was bound to become a problem at some point.