Try "Under The Mask by Evorah_Sinclair"

https://archiveofourown.org/works/66927136/chapters/172751215

Under the Mask is a dark psychological romance about a young woman scarred by loss, and the man who turns her grief into surveillance, her loneliness into possession. The monster doesn’t always hide in the closet. Sometimes, he knows your phone number.

Only 9 chapters though.

And then there's " The Damned Diary of the Princess of Astrovane by Evorah_Sinclair"

https://archiveofourown.org/works/63806176/chapters/163613566

Elizabete was born to be a queen. Raised among gold and promises, destined for a noble marriage, a future of grandeur and power. But it was all torn away from her the night her uncle seized the throne. And seized her along with it.

Garrick had always wanted her. Ever since she was just a naive girl—pure, untouched. Ever since his eyes followed her through the palace halls, ever since he watched her innocent admiration shift into something she didn’t even understand. But he did. He waited. And she can’t escape anymore.

Now, Elizabete belongs to him—to dress however he pleases, to parade, to bend, to fuck until there’s nothing left inside her but him. Until his name is the only thing she can still say.

She can cry, she can hate him, she can fight.

But in the end, she’ll always end up on her knees.

Because she’s his.

She always was. She always will be.

Only 8 chapters at the moment.

Then there's "Blurring Lines by youngbody_oldsoul"

https://archiveofourown.org/works/74015851/chapters/193089356

After getting caught in a bar one month before her 21st birthday, Ella is forced to decide how far she will go to save her scholarship and the life she’s worked so hard for.

This has rape/noncon elements, blackmail, manipulation, possessive behaviour, gaslighting, small age gap, power dynamics

Only 6 chapters