@Geist I think the idea is that, initially, they were survivors of this terrible event and Cecily was focussed more on her vengeance than anything, and probably wasn't expecting to survive. What was between them was purely physical expression. Now that her task is done, she's coming to terms with the fact that she has feelings for Shirou, and as someone who was a pirate and not used to allowing herself those feelings, it's putting her in an awkward place.
Tikkun Olam
The world is broken, and it falls on us to fix it.
The world is broken, and it falls on us to fix it.