Can I ask you a little something that's been on my mind for a bit now?

What's with this pairing of Gallus and Sandbar as intimate partners? I've seen it quite a lot recently and wondered where all of this stuff is coming from. This fandom is strange and unpredictable, but...what?

Seriously, answer my mind-melting conundrum, won't you, please? (introduce me to a lump of cheddar cheese.)