Something I don't get: they're acting like it's the first time they make love, and Maki even says it's the first time someone who's not family sees her naked -- implying she's a virgin or something.
But I'm sure Maki, in chapter 1, seemed way more competent when it came to these matters. She met Midori again, and Midori kissed her on the mouth as a goodbye... and so, for their next date, Maki had her nails cut short -- which I read as a hint that she was expecting some good old second date sex.
And, in chapter 3, didn't they have sex that night? I mean, when they slept together at Maki's place? Or did I completely misunderstand everything about that scene???