一人でお留守番することになったかなこちゃんを心配して伯父さんが泊まりに来てくれたようです…
（このときのかなこちゃんはまだ性教育の授業を受けてない幼い年頃です）

It seems Uncle came to stay over because he was worried about Kanako being left home alone...
(At this point, Kanako was still at a young age where she hadn't yet received any sex education classes)