Tsukumo, Mutsumi

A classic yuri manga about a woman who leaves her husband for an old friend from school. There are two stories in this manga--one (Moonlight Flowers) is the main story, and the other (Midnight Flowers) is about the protagonist's friend's past.
Note: this manga contains rape.
(Source: Lililicious)

Also includes another unrelated story.

Moonlight Flowers

月下美人

Wako

Imagine if there was a place for women to go, where there were beautiful women to cater to their needs, to help them relax, cast off their world-weariness and find themselves in an aura of refined luxury and sensuality. 

Welcome to the Miracle Palace.

Kiseki Goten

The Miracle Palace

Yoshihara, Rieko

Michihara, Katsumi

Nagato, Saichi

In the future, on a distant star lives a new society. Ruled by a computer system, named Jupiter, men are divided into classes based on their hair color. The Blondies, genetically altered by Jupiter, are the highest class and occupy the capital city of Tanagura. Those with black hair, Mongrels, are forced to live in the slums, Ceres. Iason, the leader of the Blondies, encounters Riki, a mongrel, in the streets of Ceres one night and sets out to own him.

(Source: June)

Subtitles for the individual volumes are as follows:
1: Stranger (帰って来た男)
2: Destiny (命動)
3: Nightmare (刻印)
4: Suggestion (昏迷)
5: Darkness (長い夜)
6: Metamorphose (衝動の引き金)

Ai no Kusabi

間の楔

Ikeda, Riyoko

Optimistic, 16-year-old Nanako Misonoo anticipates a blissful experience at her new high school. Enrolling alongside her best friend Tomoko Arikura, she is confident that her freshman year will be exciting and filled with pleasant memories.

However, upon entering the prestigious all-girls Seiran Academy, the wondrous school life Nanako had envisioned quickly vanishes as she is inducted into one of the school's most elite clubs, the Sorority. Normally only accepting the wealthiest and most prominent students, Nanako—who is neither rich nor well-known—is rumored to have cheated the selection and becomes a target of bullying from her envious peers. To make matters worse, she gradually becomes involved with Seiran's most popular students, the "Magnificent Three," comprising of the disconcerted pianist Rei Asaka, the competitive tomboy Kaoru Orihara, and the dignified Sorority President Fukiko Ichinomiya.

As a result of her abnormal situation, Nanako begins documenting her daily life in the form of letters to her former teacher, Takehiko Henmi, whom she fondly refers to as "brother," all while striving to find peace amidst the turmoil that is Seiran Academy.

[Written by MAL Rewrite]

Included one-shot:
Volume 3: Early Spring Trembling

Oniisama e...

おにいさまへ…

Shimotsuki, Kairi

Cry fell for Sig the moment he saw him at school, and though they became good friends, the relationship never progressed to what Cry wanted. But when Cry's overprotective brother Hard becomes jealous of him branching-out and having friends, Sig begins to see things in a new light. The second half of the manga focuses on Hard. As Cry drifts away towards independence, what will Hard do, since his sole purpose in life was to protect his brother...?

Also contains a short extra to Inferior Doll. (Source: Storm in Heaven)

Heaven's Love

ヘブンズ・ラブ

Okadaya, Tetuzoh

Angie, though hailed as "The Man of Tango," had never truly felt the deep, fiery passion of Latin dance. That is, until he met Hiro, a man born from a Latin mother, who was under his Japanese grandfather's custody and now lives as a Japanese citizen. Now, a slow, seething desire begins to rock his body and soul! At first feeling a nostalgic familiarity toward the Latin dancer, Hiro finds himself drawn into the seductive beat of a Latin dance, opening his body and heart to the smoldering heat of his Tango partner. 

(Source: Aurora Publishing)

Tango no Otoko

The Man of Tango

タンゴの男

Motoni, Modoru

A story about two men that have been best friends for years, knowing the fact that they have feelings for each other, and ignoring it. They discovered it on their college days and settled the matter with a time limit; if they hold the same desire years later they will do something about it. Now both of them have girlfriends, but it seems that their desires only grew stronger, in spite of loving their women. So, what happens when their girlfriends agree to make them indulge in their desires?, and have a relationship only between the limits that desire allows them...

This is a bet, to know what is stronger, love or desire?

(Source: Queen2408)

Koi ga Bokura wo Yurusu Hani

恋が僕らを許す範囲

Nanami

Endou got into an affair with the neighbor's wife and was caught red-handed by the husband, Okumura. He apologized to Okumura and was expecting a beat-up when Okumura pushed him down instead. They ended up staying and setting up a company together. Everything looked blissful until Endou found out through Okumura's ex-lover that, Okumura might be cheating on him. What would Endou do?

(Source: Attractive Fascinante)

Kiken na Otonarisan

キケンなお隣さん

Takaguchi, Satosumi

High school delinquent Mura must put up with the annoying presence of new stepbrother Subaru when his mother goes away on honeymoon. Dealing with gossip at school is bad enough, but Mura's life is turned upside down by a forbidden locker-room kiss and the publication of an incriminating photo snapped by shounen-ai fangirls.

Takaguchi Satosumi's first BL work.

Lucky-kun

Fortunate Boy

幸運男子(ラッキーくん)

Takagi, Ryo

A spin-off oneshot of Ousama Game, involving, yet another Prince (5th) ... and, of course, a Pirate... 
(Source: DokiDoki)

Kaizoku Game

Mieno, Saori

Arthur and Laurent were childhood friends that grew up together, but they had the difference of a noble and servant status. As they grew older, they came to understand the difference in their stations. Although both of them have affections for each other, such feelings could not be accepted...

(Source: Bliss &amp; Nakama)

Hanakage no Kioku

Flower Shadow's Memory

花影の記憶

Sugimoto, Ami

The third series in the "Animal X" timeline.

Having burned enough bridges in Japan, Yuuji and Minato have moved their new family to a small dinosaur-crazy town in Canada. If there's any place in the world left for Dinosauroids, surely it must be here: a town revived by the discovery of dinosaur bones, with one of the largest paleontology research centers in the world, and a network of "Conservation Centers" set up to cater to the newly-discovered Dinosauroid community. The rest of the world, None-the-wiser for the incident at the Biodome (which was covered up completely) has pretty much forgotten all about Dinosauroids.

Manga Like Hitomi ni Kiss Shite...