Toaru Majutsu no Index: New Testament - Volume 16, Chapter 3: Mutual Request for Assistance between Enemies - Double_Enemy.

After getting betrayed and killed by the only person she’d loved, Miss Shang wakes up in the body of the cowardly crown prince Shang Wuxin, who, due to her own circumstances, was actually a girl cross-dressing as a boy. After inheriting the crown prince’s memories, Shang Wuxin has three things on her agenda:

1. Clean up the house

2. Gather loyal followers and soldiers

3. Get the throne

- Description from Novelupdates

Before rebirth, Xia Man had been wondering, when did Qu Zhen begin to hate her?

Was it when she foolishly followed behind her and constantly talked while eating? Or when she would always clumsily break the gifts she was given? So she started hating her?

Did she think such a person was not worthy of being her friend at all? Doesn’t deserve the sunshine?

Right! Sunshine or whatever, it can only be her Qu Zhen!

Xia Man always felt that the friendship between the two people was like Qu Zhen’s alms to herself, never equal.

Xia Man didn’t understand what Qu Zhen meant until she died.

“I thought I never missed it. Now I understand that I’ve never been right.”

Qu Zhen, in a sense, died by Xia Man’s hands, not from a zombie.

Qu Zhen, you could never have been right after doing something wrong. You should never fall in love with a person with a distorted personality.

After Xia Man was reborn, she only wanted one thing.

She wanted those who used her to hurt Qu Zhen to die rather than to live!

- Description from Novelupdates

After living a hopeless life and getting exploited to his breaking point for his unique powers, Mithras is diagnosed with a terminal illness, about to die a brutal death when he is murdered anyway by his boss for refusing to betray his sister.

Reborn as the Human Aphrodisiac, and now equipped with a lewd system, Mithras is determined to use this second chance to avenge his past grievances and breed his boss' slimthick mom with a million babies!

But there are two problems:

1) He is now unkillable, but can only heal his injuries and sustain his immortality by drinking breast milk or love juice!

2) The System has not only turned his entire body into an aphrodisiac but also made his cum into a five-star delicacy that can not only improve the beauty of any woman he has sex with but also turn them into peerless warriors!

“Mithras, we want your secret juice!”

“Ok. But how much are you willing to pay for it?”

[Ding! Ding! Ding!]

[Hidden Quest...Bad Girls Become My Bitches...completed!]

[Hidden Quest...I Don't Stuff For Free...completed!]

Surrounded by beauties chasing after his secret juice, and persecuted by their greedy admirers, can Mithras protect his secrets and stay true to his past life's principles, or will he indulge in the temptation of his new powers, becoming the Harem God of a generation?

Spoiler Alert: Of course, he will!

After I defeated the Demon King, I was executed for false accusations by the heroines.When I came back to life, this was the first thing they said.“I know it’s shameless, but would you help us one more time? Without you, the world will be destroyed.”…Would you help them if you were in my shoes?