I've wanted a tag for these kind of mirrored handholding-images for some time, so I went and created one. I populated it with what I thought was fitting from the holding_hands -tag, but I know there's way more of these Mai-Hime OP copycat images especially on danbooru, but unfortunately fail in coming up with a good idea on how to proceed in looking them up with existing tags D:
And If anyone has a better suggestion for a tag name, by all means submit one :p.