I read this in 2014-15ish maybe, in nhentai. I posted in anime-sharing for 2 years now, still no luck. Ill try my luck in this community
There was a a great wise king with a prosperous kingdom. The king met this femboy elf and somehow he got addicted fucking the elf femboy (maybe its just elf but Im quiet sure it was femboy elf). The king succumbed to the pleasure, eventually his kingdom fell. In the last panel a naration said "the elf was sent back to the brothel".

I tried searched it by filteing the tags but no luck. Anyone know this?