https://www.cbr.com/richeh-daughter-of-himmel-frieren-witch-hat-atelier-fan-cross-over/
So the new agenda in witch hat fan art is to do cross overs where himmel and frieren are richeh's mom and dad.
I am wondering now, should this cross over if they mated scenario have its own tag? What's the bar? Upward angle frieren had a tag pretty fast, but it also had a higher volume of art and a distinct pose.