[At first he feels shocked that she doesn't immediately call him by his name. It stung, but her touch made up for it. Ai, despite being so Ai was gentle. He liked that side of her, when she chose to show it. He liked every side of Ai, even the bullying.]
I can only be me, unfortunately, onee-sama.
[he laughs a bit, stepping closer to her until he could reach out to touch her as well. He wanted to lean in and smell her but he was worried how she would react.]
You wanted mother and our father to be together, didn't you? I'm proof of that. I was born because onee-sama wanted me to be born.
[Male or Female, it didn't matter to him. He fit Ai and she fit him.]