This is a great piece I've known about it for a long while but it never occurred to me that the one who did it is an official artist for LWA. I also now know who is responsible for Akko's fantastic legs.
It's a rare pair because most of the fandom ships MaHiKaren or MaHikari. To be fair Mahiru did eat Karen in Re: Live and Hikari and Mahiru have great chemistry. That's in addition to how all three's chemistry with each other is when they're together.