I guess I should really mention sooner rather than later that, much like the whole child bride thing, I am really not sure when and how this series got the Shoujo Ai tag across all these websites. Whether it stemmed from the same mistaking of Mururu as female, taking the mouth to mouth feeding in chapter 1 a bit too serious, or whether it was just based on the author's priors, but it is really not actually that kind of series.
That's not to say there's absolutely no sort of at least gay-ish content going forward, but it's definitely less than even like, Centaur no Nayami. I just really don't want the tags to be giving anyone any false expectations. The series goes in a lot of different directions but unfortunately that just does not seem to be one of them (I've really only skimmed the latter two volumes, but believe me, this is not what those are about).