I guess now we can't deny that those hentai doujins are in fact, cannon (or gonna be)
Just a crazy person would deny that it isn't part of the story. They kiss, they have bath together and they sleep together haha.
They don't 'kiss' - YET - as in a shared thing - all the master has done is - per the sound fx - touched her lips to Mel's - and then licked her tears off - to calm her down and reassure her (the latter probably inspired by the dog lol).
They have not bathed together - that is a different series - the stuff in it did not happen for these new versions of the characters. And they only share a bed - not 'sleep' together in that sense.
I will agree they look like they are going in that direction - but like I said before we may never see it in this version since it is published in a magazine. So to call it cannon is WAY jumping the gun.