The Long Drive (Jujutsu Kaisen)
A nine-hour road trip with her brand-new stepbrothers turns agonizingly intimate for Lilith when she's crammed into the backseat with Ryomen Sukuna, whose wandering hands ignite a forbidden romance that will leave a lasting, life-altering consequence.
You may also like

The Stepdad's Examination
wysteria
Trigger warning Smut ahead, so read on your own risk. A young woman experiences unexpected pleasure during a routine gynecological exam by her stepdad, leading her to question the nature of their relationship.

Friends Don't Kiss and Tell (Yuji x Reader)
kai (•˕ •マ.ᐟ
Childhood best friends Yuji Itadori and you have been “practicing” kisses, touches, and everything short of going all the way for years with zero malice… but at Tokyo Jujutsu High those innocent sessions are starting to feel dangerously real, and Yuji’s sweet golden-retriever charm is slowly cracking into something much hungrier.

The Devil's Wife
carcam
In an isolated Edo-period Japan, Ryomen Sukuna is the Shogunate's most feared and powerful samurai lord: a merciless man whose name alone inspires terror. When a tiny, shy Italian-Japanese captive is presented to him as a concubine, intended as an insult by his political enemies, nobody expects him to keep her. Much less marry her. Months later, Alba Hoshino is his lawful wife, cherished behind the closed doors of his estate and protected by a husband whose love is as possessive as it is absolute. To the outside world, Sukuna remains the same ruthless monster. To Alba, he is her entire world. But Sukuna's affection has a dangerous edge. His jealousy knows no reasonable limits, his possessiveness borders on madness, and even the smallest sign of another man's interest in his wife can provoke his wrath. He has conquered territories, broken clans, and made powerful men kneel. Now he has something he refuses to share. And he would rather watch the world burn than lose her.

Road Trip with My Stepbrother
wysteria
Trigger warning Smut ahead, so read on your own risk. Trapped on a cramped family road trip, Sienna discovers her stepbrother Lukas's wandering hands beneath her skirt, igniting a forbidden secret that could shatter their new family.

Not so boring life
InnocentFlower
*! EXTREME SMUT WARNING !* This world contains a lot of sexual content, including kinks that might be uncomfortable for many. Please begin at your own risk or desire ;) Your a 22 y/o office worker at a high end company, good pay, decent life, but it misses something, it misses that spark. And you happen to find just the way to solve that.

“I’m not your ‘daddy’..” | Nanami Kento as your new sexy step dad.
unrealsedative
When your drunk flirting pushes your stoic step-father Nanami Kento too far, he decides it’s time to teach his bratty new stepdaughter a firm lesson after midnight when your mom isn’t home.

Six Eyed Cheater
anna
In a world of curses and sorcery, Satoru Gojo's wife discovers the ultimate betrayal—his heart belongs to his best friend, Suguru Geto.

Across the Boundary
Bugz
Of all the bastards in that pub, it had to be the one next door.

Just a drinking game
InnocentFlower
*!SMUT WARNING!* This story contains smut and very detailed sexual scenarios. Please have this in considerstion before starting. Enjoy! You just got ditched on a date, your frustrated of how much of an asshole he was to not even message you about not going, so your friends invite you too a private game later that night.

It Was Supposed To Be A One-Time Thing: Sukuna College AU
kai (•˕ •マ.ᐟ
Your arrogant roommate Sukuna finally cracks the one girl immune to his charm when you accidentally send him your filthy solo video instead of the party clip he asked for. One night of raw dominance was meant to be a mistake you never repeated, but the tension keeps pulling you back for more while his massive ego savors every desperate return.