Can someone explain to me how the "Wild Card" square works? Like, do I just pick a thing and say I did it? Or is there a more specific set of rules for that.

Second, I know "fluff" usually implies some sort of romance, but I just recorded a five times fic where one chapter is literally two bros who are not in a romance with one another AT ALL shoe shopping for the partner of one bro and it feels really fluffy to me, but also it's not specifically fluff. Are there accepted definitions of what's "fluff" here?