To anyone who doesn't fully understand this ship, I would HIGHLY suggest reading Kawacy's description of this ship here: https://www.instagram.com/p/CEmoUaIBz0U/?igshid=6dolonx0wda1
I notice that kawacy doesn't post a lot of art of her as a little girl here. It could be the fact cause they're just sketches/non polished art or because he's trying to hide the fact that this man raised her as a child and those comics/artwork exposes that. A lot of people started question what their relationship really was after seeing a lot of artwork with her as a little girl and in the link above it shows that this man did indeed raise her like an adoptive father and then later fell in love with her. Many people saw this as grooming, others saw it as not grooming but still really gross, some don't see it gross at all.
This is just for information sake, as I know some people are rather sensitive to this topic, and its only fair that his audience on dA understands whats going on just as much as his audience on twitter and instagram.