Incest /Family

Another Raising a kid gone wrong.
20 years ago, Genji, a widower and former Yakuza, rescued what he thought was an abandoned kitten in the rain. That ‘cat’ turned out to be a shape-shifting non-human, and Genji found himself raising a young boy. Now, that boy has grown into a handsome young man, and now, their relationship begins to change.

Hmmm..... well, Uke's half brother is so into him.

Three different life, Three different Couple
2nd couple comes in this category.
In 1st lifr they were step brothers, 2nd life adopted brothers while 3rd life they still brother toh not confirm wether real, step or adopted.

Step brothers (not blood related)

I had bad impression about this before reading but after reading, it's not bad.... just step brothers falling in love (Guilty pleasure), they ain't really blood related toh. Seme is super Possessive but not toxic. Well uke is bit annoying with his indecisive decision. Overall it was good and we even got a happy ending with baby.

Selfcest
I thought this was another body swapping story but No.They just took Love Yourself on whole another Level...... LoL

After accident, asshole MC return to his past but in another person body and his past asshole self is obsessed with him (Future asshole self but in Beautiful body) Because He's a Narcissistic asshole.

Adopted Brothers
I really liked the world-building and story but I'm not a fan of the rom-smut in here. I do love the art style toh. This had potential but sadly...RIP Author.

Yeonwoo, an adopted Hunter, serves in the military to spare his younger brother, Jungwoo, from enlistment. When a mysterious dungeon appears near Jungwoo’s university, Yeonwoo volunteers for a dangerous mission, determined to protect his brother’s peaceful life at any cost.