Otto No Tamenara. -junpuumanpanna Toyomitsu Tsu... |link| Instant

That being said, I'll try to create a general article based on my understanding of the keyword. Here it is:

• The Fertility Symbol: Her design draws upon ancient and Freudian associations between plumpness and fertility/motherhood. In the context of the "Debu" (fat/chubby) fetish subculture, her body represents a distinct form of eroticism focused on comfort, envelopment, and exaggerated femininity.
• The Matron Figure: Toyomitsu embodies the "Married Woman" (Hitozuma) archetype. This carries specific connotations in Japanese erotica: experience, unavailability, and a specific type of ripe maturity. The title itself reinforces her status as a wife, making her sexual availability to men other than her husband the core conflict of the story.

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If you are looking for where to or buy the physical "paper" (tankobon/magazine) version, you can check Japanese digital storefronts or adult manga retailers like DMM/FANZA or DLsite . Otto no Tamenara. -Junpuumanpanna Toyomitsu Tsu...