Her plain, busty breasts who can't refuse if asked, are pierced with her anus, and her ass is confirmed to fall into pleasure.

I, a plain office worker, was invited to dinner by a man from the same workplace. If you allow that person to both their mind and body (anal) you won't be able to maintain the rationality they had been suppressing... From that day on, when other male employees invited me, I couldn't refuse. I was caught between guilt and pleasure and offered my ass an ass-apparel myself, and the male employees I had with were surrounded by him...