Darling, Why Do You Regret It?

Rio was living a perfectly normal high school life, when suddenly the amazing transfer student, Tomo-chan, appeared before him. Rio watches the guy, with his overpowering aura, from afar. Until one day Tomo-chan picks up Rio's dropped planner with a picture of his beloved idol, a (male) teacher, inside. Tomo-chan suspects Rio is gay, and after stating that he's going to "cure it," they embark on a sexual "Homo Fixing Training Regimen"! As for Rio, despite thinking that he shouldn't be, seems to feel something...

I secretly met my husband’s mistress. Delicate, lovely, and sweet, her name was Saira. “I’ll never leave the Duke!” “Now, *that’s* the spirit.” “W-what?” I had reincarnated as Tareia—a noblewoman with a wealthy family, beauty, and nothing to feel inferior about in life. But there was just one obstacle in my perfect plan: “Keep seducing my husband.” I was ready to toss him aside and live a fabulous single life. …Or so I thought. “I’m starting to find you fascinating.” “Can I call you… *Lea*?” “My lady, please, anything but divorce.” Why are these men suddenly acting like this?!