[at the end of the day, he knew that there must have been a reason that Illya called him that in his world. it was unfortunate that he'd never had a chance to try and get to know her better. she was just a little girl (or so he'd thought) in such a terrifying war. as he listened to her story of how they knew one another, it started to make sense how she would think of him as her brother. although in his life, he'd never been associated with the Einzbern family, living a normal enough life as a child before the great fire changed everythinhg. to Emiya Shirou, being a hero of justice was his path. so many possibilities out there though...]

Ah, I guess that makes sense how you're so fond of me. [at least, he hoped that she was. he didn't want anymore enemies] Oh...well... [how did he say this?] The truth is, I never got to know the Illya of my world well. I saw her one night before I summoned Saber.

The night the Holy Grail War started though, we became enemies.