Completed BL I've already read

dumb
Hajin Park doesn’t have much beyond a pretty face. He’s jobless, lives with an annoying roommate, and has the aspirations of opening an online shop. His sister will help him achieve his dreams on one condition: he gets the autographs of famous idol group Eight Nine. When he finds pop star Hangyum Lee pleasuring himself in a bathroom stall, it’s not just Hajin’s memories of their past together that gets stirred. A twisted romance begins.

Non-Con
Korean Wolf Kang Doha is quite popular in school. One day, he bumps into the fox, Yeojoon, who's been spending his days in school as a loner. Doha finds him irritating, but he couldn't stop seeking him out. Is this... perhaps... love?

Comic artist Seonho, who draws R-19 series, hires beauty-and-brains Muyoung with outstanding skills to be his assistant. However, working with Muyoung who is too task-oriented and has a prickly temperament, turns out to be a bit difficult. Seonho asks Muyoung to pose for him one day to help with a scene, but when he saw how erotic Muyoung's pose is, Seonho's dick... that hasn't stood in 2 years, got up. It's hard! It got hard! It finally got hard!

(They are however underage)
Prequal to Kazoku Ni Narouyo

Chiaki and Kazuma are a couple. Tomoe, their friend, asks to see them, but when they meet they discover she's pregnant! The father is unknown, and although Chiaki and Kazuma are annoyed with Tomoe, they help her. Soon after, the baby is born. The two men are relieved that she is acting like a proper mother, but one day, Tomoe comes to them with tears in her eyes and says, '”Take care of her for me...!”
This is a story about a new family

The second year of university, a time when a student should be able to enjoy their youth. Even though Kotarou has few friends, he enjoys his calm life. However, because his childhood friend Miyako was being pursued by the university playboy Yoshino Aoi, Kotarou was forced to pretend to be her boyfriend. Kotarou thought that he was able to fool Yoshino, but he was caught. “I've given up on her, so I want to get along with you now.”

Underage
Akihisa was bullied for being an otaku, the chance to change his appearance and restart in a new school surfaced when his father had to transfer. Going around the school, he found a volume of his favorite manga and got so entranced he didn't notice the manga’s owner, Yuu, was right there and saw him in full otaku mode. Akihisa thought he had blown his cover but Yuu was unexpectedly nice to him and they soon became friends, until one day…

Underage
Itsumi hates fighting. He's a student at a fancy high school who loves visiting cat cafes and collecting cat-themed merch. Despite that, he looks like a yankee, which alienates him from his classmates, making him a magnet for dodgy people outside of school. One day, the unthinkable happens: the popular student body president, Seima Takajou, professes his love to Itsumi! This is a romance between polar opposites: a popular hot guy and his gap moe prince

Underage
Sequel to You’re My Princess
"Kissing you feels so good, I could die..." *Nosebleed* A weak top who's hot, but not quite a prince... falls in love with a cute, mischievous "princess" of a boy. What lies in store for these two!?

Underage
1-2) Nise x Koi Boyfriend
3) Yowamushi Kareshi to Rokudenashi
4) Kimi to Boku de Chouchou Musubi o
5) Usotsuki to Happy End o