I personally think the part with them as kids is appropriate. Regardless of what laws say and how adults think. Children some even younger than these two lovebirds do experiment early and it does and can lead to sex. Just saying just because people find Loli wrong, disgusting, or just gross it doesn't stop it from happening. Whether the experience is a fortunately pleasant one or an unfortunately bad one.
Not bashing anyone for their opinions I'm just sharing my own is all.
Back to the this. The doujinshi was really cute and innocent especially sticking to the ideology your first kiss will taste of lemons. Oh man the ending; with the promise of marriage and that kiss tasting of lemons. Brought it all home!~~ I loved it, it was sweet, nsfw fluff kudos to the author!!!