A loosely colored version of an older sketch, here's the lore again:

"Tumbling” in the culture of the Aratrice followers, is one way to officially ask someone to be their lover is to go on walks in the wilderness, and to walk to a hill, preferably a non-dangerous one, and suddenly hug them in an embrace and tumble down the hill with them, and then when the two reach the bottom, and rest atop or beside each other, the one who initiated the tumble will ask them to be their lover, not everyone does this, but it became a fairly common act, no one knows who first started it, this lead to the term “tumblemates” for a relationship being created.