A Hentai System in the World of Danmachi - Chapter 249 - 248 - Letter from a fan?

Suzuki, an adult programmer, suddenly notices that he’s been thrown into a different world while wearing a casual clothes at level 1. He gained high levels and treasures after using the 3 times use-disposable-magic, Meteor Shower, once. After that he intends to do different world “sightseeing tours”? He meets 3 beast girls, beautiful purple and black haired sisters, and an eccentric blonde haired elf girl along with various people during his trip. Although there are occasional fighting with demons and demon lords, this is a heartwarming fantasy story at heart.

A young orphaned boy named Mu Yi is saved by an old travelling Taoist Priest. They travel the world ‘scamming’ people by ‘exorcising ghosts’ and ‘slaying demons’, that is until the old Taoist Priest dies and Mu Yi is forced to realise that all is not as it seems. He was told stories of armies of ghosts, hordes of zombies, horrifying demons, and worst of all, the cultivators who controlled them.

Mu Yi takes his first steps towards rising to the top of this dark and cruel new world.

- Description from Novelupdates

Ling Xue traveled through the fantasy world and became the villain.At the beginning of the story, he gained an extraordinary ability linked to the consciousness of the number one heroine.The stronger the heroine imagines him to be (only on the surface), the stronger he becomes (In Reality).The heroine perceived Ling Xue as an enduring force, an invincible golden spear. She believed that Ling Xue has reached the pinnacle of cultivation and can achieve the highest realm.…So far, Ling Xue has only pretended to be imposing, leaving the rest to the heroine’s imagination…

He transmigrated and got a system but Lin Feng’s pressure is as big as a mountain.