MTL - The Last Gentleman - Chapter 421 point the way

Holo’s life was once a series of relentless hardships—bullies at school, abusive parents, and heartbreak at the hands of those he trusted. After a failed suicide attempt, a mysterious man offers him a deal: help rehabilitate four psychopathic girls, and in return, earn ten million dollars. Desperate and naive, Holo accepts, not realizing the chaos and danger awaiting him.Each girl comes with her own dark tendencies—Trixie, a violent and feral girl who acts on impulse; Scarlet, a master manipulator who delights in breaking people down; Felicia, a dangerously seductive woman battling a sex addiction; and Eleanor, a cold, calculating girl with a desire to watch the world burn. As Holo works to bring out their humanity, the girls become obsessively devoted to him, their love transforming into something darker.

When the last prodigy level esper on Earth disappeared, Earth was in deep trouble of becoming another species’ colony. The ordinary Han, with his intelligence and hardworking character, was able to make a fortune after “accidentally” stepping into the world of dark net, later purchasing an esper power crystal that brought him the ultimate power that changed the fate of the universe.

Dark net is a subset of the Deep Web that is not only not indexed by traditional search engines, but that also requires special tools like specific proxy or authentication to gain access. Dark net is not restricted by any law or morals, so the dark net market has everything that is prohibited by the law. Drugs, slaves, firearms, uranium, bioweapons, rare animals, human testing, assassination, and the list goes on. During the year of 2075 on Earth, Han Lang logged into the largest hyperspace dark net market, and our story begins.

- Description from Novelupdates

Warning!!! This novel contain scenes that are not suitable for children. That includes on killing, suicide... torture... and R-21 scenes

Keira Del Carlo sold her virginity in the auction to save her mother and a billionaire bought her for more than 4 million dollars. Her life turned upside down when she signed the papers that the billionaire gave to her that night after she gave up her innocence.

Alessandro De Alegre was a vicious billionaire when it comes to business. But behind that merciless attitude, there's a soft spot that only meant for her.

He has been searching for his first love for a very long time until he found a lead that she's in an auction. He took advantage of it to have her back and made her sign the marriage contract while she's not herself. She didn’t even recognize him, and that’s when he found out that her memories with him had been erased.

All her time with him, he gave her everything including the Golden Age Entertainment that should belong to her. She lives with him without knowing that she's married to him the night he took her innocence and imprisoned her in his villa. She lives thinking that she’s the mistress.

The Student Council President’s Secret Laid Bare (生徒会長のセキ裸ラな秘密) is fairly standard 2D Dream Bunko fare but with an exhibitionism theme.

Basically, it’s about a guy who discovers the student council president is an exhibitionist and gets roped into helping her with that fetish.