Emiya
"Well, you really were a horrible parent then," Emiya grumbled before he realized the words were out of his mouth.
He felt his cheeks heat up and he sighed. "I didn't mean it like that. I just didn't expect I'd have to shelter a teenage girl. Fuji-nee never talked about that stuff. We just knew it was happening because she became even more of a monster. You and Rin never talked about it either. And Ilya . . . Ilya didn't have to worry about that."
Even though it bothered her. Even though she wanted to feel what other girls felt, wanted to know what it was like to make love, have a boyfriend, that sort of thing, he thought, still haunted by his sister after all of these years.
She had wanted him, and all he saw was his little sister.
He shook his head to clear and added, "And Jack, Nursery, and Jeanne Alter Lily don't worry about it because they're Servants."
Oh god, I found three Surrogate Ilyas in Chaelda.