The black plague
Once a man’s young sister-in-law came for a visit. How could he fuck her? He turned it over and over in his mind and finally it came to him!
"Hey, wife, I'm going downtown."
Then he climbed up the mulberry tree in the yard, disguised his voice, and began to shout:
"I am the black plague! Stojan must fuck his sister-in-law!"
He returned home.
"Oh husband! When you were in town the black plague came and said that you must fuck my sister!"
"Oh, is that so. I'm going into town again, I have some business."
And again he climbed up the tree:
"Oooo! I am the black plague! Stojan must fuck his sister-in-law, or I will destroy the whole town, so take heed!"
Then he returned home.
"Husband, the black plague came again and said that you must fuck your sister-in-law or else he will destroy the whole town. Oh dear, oh dear, what shall we do?"
"How should I know?"
"Wouldn't it work if I got ready, and then you almost put it into my sister, and do the rest to me?"
"Oh, no! If I have to fuck her, I'll fuck her!"
Kiril Penushliski. Macedonian erotic folktales