MTL - Deviant Immortal of Uncanny Dao - Chapter 17 found it

She is a top-class spy, a poison specialist, but also a young and cute girl with a sinister temperament. In spite of her sweet and innocent appearance, she can complete any tasks without the slightest hesitation. One day because of an incomplete black magic, she was sent into the body of a girl who was deemed as a good-for-nothing. What kind of change will she bring to this continent?

A Prince said with bitter hatred, “I thought she was weak and easily bullied, therefore I broke off the engagement. I really didn’t expect she is such a shrewd girl. I made an error of judgment.”

The Crown Prince deeply sighed, “She is such a sexy evildoer! Obviously, she has a frail and tender body, but I am not able to overwhelm her…”

Finally, an Emperor hit the nail on the head, “She is just a bit two-faced!”

She answered, “You’re just a big pervert!”

The Emperor carried her into the room and said, “You are predestined to be mine! A two-faced girl and a pervert are a perfect match, right?!”

- Description from Novelupdates

Kuramoto Daisuke, a freshman in High School was suddenly exposed to someone vanishing in front of him. Turns out he was admitted to a Special Class full of Isekai Heroes that were regularly summoned to Otherworlds since the start of their Middle School. He was told that he was to become their Support to prevent each of the Heroes' fate of dying in the world they were summoned into. Though mediocre, he realized that his ability has a great potential but it needs a lot of hard work on his part.

Unconvinced of being just the Support Character, he vowed to excavate his mediocre ability, all the while supporting the Heroes using it.

And maybe more.

Sophia was adopted when she was a kid, a dream come true for orphans. However Her life was anything but happy, her fiance whom she harbored intense love for 10 years cruelly exploited her and used her as a prawn to lure a deranged murderer targeting his lover.It is a horrible thing for your loved one to betray you, especially in a tragic manner. It seemed she was spurred by the complete despair over having nothing and no one to live for. Therefore, she surrendered without a fight. However, after her death.One would not expect a woman like Sophia, someone small as a caterpillar or even a dung beetle to be reborn, But here she is—perhaps she might have saved a kingdom in another life, or maybe God pitied her. She finds herself reincarnated as a timid and obedient wife of a billionaire.Sophia decides she wants revenge that could ruin her fiance and lover's life.And the only way to do that was to get pregnant with her billionaire husband's child!Dexter Black was the illegitimate son of a wealthy family, their marriage was nothing but a benefit for the two families. He could choose anyone to be his bride but the moment he laid his eyes on her,he knew she was the one he wanted. Dexter knows that there is something mysterious going on around her. She got a mystifying background. But he doesn't care about who she was in the past and why they keep attacking her. All he can think of is loving her, cherishing her, locking her up so that she will never return to her past. Because he knows that he won't be able to live a moment away from her.Would their marriage be a romantic tale or utter disaster?~ Except~“Wait, let me get this straight,” she says, her voice rising.“You want me to get pregnant?”Alexander's face remains impassive. “They, yeah.”Sophia stares at him, searching for signs of a head injury or a hidden camera crew. Finding neither, she decides this must be his twisted form of play.“You're going crazy,” she announces, grabbing her things. “I'm leaving.”She's halfway to the door when his words stop her cold.“It's either you get pregnant, or they won't allow you to leave until you are,” Alexander says calmly.She pauses to process his words.