Boku ni Sefure ga Dekita Riyuu has a rather curvaceous wife succumbing to forbidden desires as she has sex with a man other than her husband, forming a sex friend relationship with the male, and whether or not the husband finds out might be a critical element.
Some of the intense sex the pair get up to is exhibited in the first episode PV, though some may be turned off by the overly plump nature of the woman:
Boku ni Sefure ga Dekita Riyuu’s secret affair will shake things up on October 7th.
Watch online links:
https://hentai-ani.me/boku-ni-sexfriend-ga-dekita-riyuu/boku-ni-sexfriend-ga-dekita-riyuu-episode-1