".. oh. Um."

He pauses for a moment, closing his eyes and then opening them again when he speaks to look at Taiki.

"Mother.. The one who was here, she was from the past. She already gave birth to my sister in that past, so that's why the idea of her being here troubled me.. I don't exactly want that baby to be left without a mother."

Better him being left without a mother than a poor baby, after all.