HOMG. This is blithelybonny (finally got myself an IJ), and wow. Just, just wow.
Firstly, Harry/Susan hate!sex in such a perfectly believable way. The Susan you've created is exactly the way I picture her to be post-war, and this entitled!Harry is seriously awesome. I loved the part where she called him out on using his 'all my family is dead' argument with her. Fantastic.
Secondly, up against the wall ftw! I love how even the sex became a competition. Just such a perfect way to get them together and still make it believable. And the sex itself was very well-written, hot and steamy, but not too over-the-top.
I totally want the sequel where Harry wins. Really great, great job, mystery author. I love my present!