I am unmarried part 1 (Pixiv Fanbox)

年の離れた姉の大人しい子、所謂「甥っ子」の面倒を見ることが、気が付けば私の役目みたいなものになっていた・・。未婚である私だから、姉もきっと頼みやすいのだろう。でも私はそれが負担ではない・・。むしろ・・私の空虚な心の穴埋めをしてくれるほどの・・暖かい存在だ。でもどうやら私は・・、調子にのってしまったみたい・・。もう止められないかも・・ Before I knew it, it had become my responsibility to look after my older sister's quiet son, my so-called "nephew." I'm unmarried, so I'm sure it's easy for my sister to ask me for help. But I don't find it a burden. On the contrary, he's a warm presence that fills the void in my heart. But it seems I've gotten carried away. I don't think I can stop now.