NTR: Choice Based System - Chapter 3: Heaven and Earth sacred oath contract

Xue Xi is forced to fall in love at first sight with this dangerous man on their first meeting. With death being the only other option, she makes the first move:

Silver Ventirose experiences the biggest turnaround in his life after he consumed to the other side a great portal.Transporting him into a world where only he can cultivate and that too very easily!!He is given the task to take care of primordial serpent's child. With his maxed out luck and the system on his side, he hopes liberate the world from the evil that comes.----The pace of the story is medium as I like to live in the moment a bit more than others, but some scenes will move faster too avoid too much bore and lore dumping.

A man reincarnates in the body of a boy who suffered a tragedy, only to realize that he is in the world of My Hero Academia. What's even stranger is that his quirk seems to have the abilities of Nen and Haki.

She is the underworld Ghost Doctor’s only disciple, who accidentally transmigrated into the body of the main wife’s daughter in the general’s mansion. She used to be a punching bag.Now, she stepped on her dregs of an older sister, put her father’s concubine in her place, and teaches any objectionable aristocratic ladies a lesson.

Her days are rather free and unfettered. But when did that cold as ice prince from the rumors, sporting a deadpan face all day long, fix his gaze on her?
He unexpectedly fawned and pandered to her like a devoted dog?

“Go away, you rotten man! Careful or I’ll needle you like a pin cushion!”

“Wife, why are you so fierce? As a husband, I’m so scared”
….the man is all smiles as he approached, his eyes gleaming with a cunning light.

- Description from Novelupdates