This is long, so only read if you are into social justice and new thoughts for your brain!
Spoilers
Society only presents to us a very pigeon-holed view of what makes up 'acceptable' relationships. This manga is wonderful at teaching about a type of love and way of living that is not mainstream. One only needs to read with an open mind and remind oneself to analyze what the difference is between what one truly believes to be love and what society has programmed into one's subconscious to believe.
Who are we to say what is manipulation and when a child can 'officially' be allowed to know what they want? Who are we to judge what is 'sick' and 'perverted?' Who are we to say one cannot love their sibling or their parent? It may not be for us, but who are we to stop someone else? Wrong and right is not so black and white as Christianity has tried to teach the masses for eons of oppressive years. Does a 14-year-old child's passionate feelings and beliefs only become 'real' or tolerable to society when they turn a magical 'adult' age? Do feelings of 'sexual love' only become acceptable when a person is unrelated to us by blood? To me, all these little divisions are silly and boxed in. Humans are far more complicated than that. I completely understand and respect someone being squicked though. That is their right and they have entitlement to it and to share it when one asks them what their opinion is. (Like this comment board here!)
Beautiful story, indeed. I am not a fan of Chi-ran's art style, but her story was truly touching to me. I can totally understand lots of people being 'squicked' but that is a big difference from 'disgust.'
Of course, there is always the possibility of abuse in a relationship, regardless of age, and all those, again: regardless of age, should be entitled to help from an abusive situation. And that is something completely unrelated to this story, in my mind.
And finally, here's a quote that made me laugh and ponder because I find SM to be of a personal fascination and interest (not necessarily true of the majority!):
"When you love someone a lot, you'll want to tie that person tightly to your side. but it is not possible to do that in reality, right? But SM allows you to physically tie that person up."