Japanese title according to Paiman: 題名:里の資産家になって慧音が体を差し出すことを条件にして死ぬまで援助したい。(Topic: Having become a wealthy person of the village, I supported Keine to the last, on the condition that she submit her body to me.)
An illustration by Warugaki based on a small novel written by Paiman (パイマン). Warning that this is unusual work from Warugaki, as it contains somewhat visible and implied molestation/rape of Keine.
Paiman's original mini novel: Link (see #24 of the interview)
Warugaki's Illustration: Link