[Ikki nods, he understands quite well what Marco means, it's also why he asked that question, he figured the answer would be a negative but what other reasons were there to have sex? Many others apparently from what Marco says. He flinches and tenses at the comment about his mother, it was something he never tried to consider or question. Even if he is sure he knows the answer it was one he preferred to not think about.]

She didn't. I'm sure she didn't, definitively not the first time.

[Why would she? He's sure she was never married and that it all was a one-night stand, maybe a bit more but definitively not something that would last even if she thought it would. A child couldn't enter her plans or thoughts, specially not when Mitsumasa left her.]

If it's not to have kids, then why do you have sex with her?