From Be Beautiful:

Three's a crowd. Ranmaru and Kei have a strong and passionate relationship built on years of trust, sacrifice and love. When the mysterious son of a Yakuza boss starts to have designs on Ranmaru's affection, tempers flare, and hidden emotions rise to the surface. Will Ranmaru and Kei's love for each other be able to survive this difficult test, or will the emotional conflict finally come to a head?

From Shinkirou Scans

"Our love always wavers between life and death."

This is the story of J.B the sniper and Roy from Kizuna.

This is a really cute, sweet story about two single dads Asakura and Kentarou, whose young sons happen to go to the same daycare.

From ADV:

Vampire vs. vampire, with humanity in the balance! The destinies of two people, along with the fate of the world and its inhabitants, are about to become intertwined.

On a rainy night in California, Osamu encounters a capsule that holds a mysterious green-haired being. He soon finds himself in the middle of a power struggle, as warring factions of vampire aliens descend to Earth. On one side are those who seek to use the recovered alien--Kimera--to repopulate their dying race. On the other side is Kimera's former mate, who wishes to kill him. Will humanity face total destruction, or will Kimera be killed, ultimately saving the world?

Set in ancient Japan, involving many explicit steamy sex scenes. Shirou and his little brother are captured by bandits, and he is given two options: become the leader's sex toy, or watch his brother die. (And just wait 'til his brother grows up... sexy boy...) Unlike some other hardcore yaoi, this story *does* have a plot and can be rather sweet and sad at certain moments.

The one-year-younger cry-baby and childhood friend, Kanade, suddenly took Meguru’s first kiss! Though he's grown taller a bit recently, and the girls made a big fuss and called him “the piano prince”, I will not be tricked. He’s a pervert who steals another guy’s lips! With additional pages, the perfect version is now on sale. ♥

The first chapter was originally released as chapter 4 in volume 2 of Not Ready!? Sensei.

Born of an Incubus clan, Tsukiya has had enough of the pain that comes from only bringing death to the human men he comes to love and so closes his heart, and denies himself from ever again feasting on human souls. Gento, the ever persistent demon that he is, has never been far from Tsukiya's side and has seen him mourn the death of many lovers, never understanding why Tsukiya continued to seek a love with these mortals that would forever bring him nothing but pain. Now years later can Gento, still ever pursuing Tsukiya, finally win over Tsukiya's heart for himself, and can Tsukiya help a young Incubus through the pain that comes from falling in love?

Atsushi Arisawa enrolls at Jougaouka High School to be near Masami Shibata (Ma-chan) who was his childhood crush. Unbeknownst to Atsushi, however, Masami no longer works at the school and his brother, Masayoshi is now the nurse. Atsushi mistakes Masayoshi for Masami and is horrified because to him, it appears that Masami's personality has done a complete 180. Add to the fact that Atsushi's friend, Kouji Inagaki is totally in love and constantly trying to make-out with him, Atsushi's life at Jougaoka is hell until he starts thinking that maybe the new Ma-chan isn't so bad after all and that, maybe he actually likes the way Ma-chan is now. Until of course, he finds out that Masayoshi isn't Masami.

Volume 1
1-3. Not Ready!? Sensei
Murakami Hiroshi makes a living out of drawing yaoi manga, though he claims not to be gay. He has a girlfriend, yet regularly sleeps with another man, and even seduced his assistant. His sex life's a mess... will he ever figure out what... or who he wants?

4. Toki no Okibi
A wandering monk searches for the man with the mark of a magatama.

Volume 2
1-2. Not Ready!? Sensei 2

3. Unbalance
A chapter about Shinozaki and Tanabe, from the main story.

4. Love Formula
The first chapter of Renai Houteishiki.

5. Happy Dream?
chapter of Kusatta dj - Happy Dream?

6. Welcome to the Wild Island Kingdom

From Essence of Purity:

Takuma Ban, only son of the Ban familly from Hokkaido, comes to Tokyo on a quest: to find a fitting wife... with the help of Meari his cow. Jumping over a school fence while carrying Meari on his back, he unexpectedly meets a girl, Yuki Samejima. After one minute, he decides that SHE'll be his bride. Unfortunately for Takuma, Yuki's older brother, Ranmaru Samejima, is completely opposed to this.

Of course, the fact that Meari seems to have developed an instant "animal" attraction to him only reinforces Ranmaru's dislike of Takuma. Takuma is determined to make Yuki his bride and that, despite Ranmaru's stern "objections". Nevertheless, when not only Kei Enjouji but also Takuma's own family start getting involved, things get a little … "chaotic".

(Note: was originally debuted as a shounen manga, but Kodaka switched publishers and began writing it as BL)

Yamato runs a detective agency that will use any means to get the job done, no matter how unconventional. His three misfit employees are more than his teammates, they’re his family too. Also tells the dramatic and surprising story of Yamato’s past.

A series of short stories about business men in a romantic relationship.

Volume 1:
1) Sebiro no Housekeeper 1
2) After 5 PM Wolf Man (continuation ch1)
3) Dr. Arima's Medical Records 1
4) Not Ready?! Sensei 1 (Prequel of Not Ready!? Sensei)
5) For Whom The Bell Tolls
6) After 5 PM Wolf Man 2 (continuation ch2)

Volume 2:
1) Sebiro no Housekeeper 2
2) Dr. Arima's Medical Records 2
3) Not Ready?! Sensei 2 (Prequel of Not Ready?! Sensei)
4) Sebiro no Housekeeper Extra (New Edition)

As a child, Kasama Ryuuji watched his parents killed before his eyes by the rival, Yazuka gang. As a teenager, he finds the woman who raised him after the death of his parents, raped and murdered by the same gang. With the lost of his loved ones, Ryuuji wants nothing more to do with the Yazuka. When everything seem lost, the kind and caring, Araki, who claims to be the brother of his adoptive mother appears. Ryuuji develops a special bond with Araki but how will Ryuuji react when he learns that Araki, in fact, is the only surviving member of the Kasama gang, who has devoted his life to protecting Ryuuji. Will Araki-san, the dragon, be able to keep Ryuuji safe, or will his enemies use the young man as a pawn against him? (from MegKF by Rogue11)

NOTE: Each Hana to Ryuu Soushuuhen volume compiles 4 doujinshi volumes.

Hana to Ryuu Soushuuhen 1 (1998)
#1 Chiri Isogu Hana
#2 Hei no Naka
#3 Ryuu no Tsume
#4 Futatsu no Saikai

Hana to Ryuu Soushuuhen 2 (2000)
#5 Shinjitsu wa Yami no Naka
#6 Yomigaeru Akumu
#7 Mienai Tobira
#8 Ryuu wo Karu Mono

Hana to Ryuu Soushuuhen 3 (2003)
#9 Hebi no Rasen
#10 Kienu Juujika
#11 Karamiau Kizuna
#12 Tsuki ga Michiru Toki

Hana to Ryuu Soushuuhen 4 (2006)
#13 Kaiko to Zouo
#14 Kioku no Kakusei
#15 Aizou no Yukue
#16 Hebi no Doukoku

Hana to Ryuu Soushuuhen 5 (2007)
#17 Ai to Yami no Hazama de
#18 Yume no Mahoroba
#19 Matoitsuku Bourei
#20 Tamashii no Doukoku

#21 Tomurai no Hana (2009)
#22 Kibou no Akari (2009)
#23 Tabidachi (2010)