From Blissful Sin:

Haruka is good-looking and popular, but quite the devil. Tokiwa is a quiet and shy loner. After their chance encounter in Katekyo!, the unlikely pair have begun dating. Though he was aware of Tokiwa’s reticence, Haruka is beginning to feel frustrated with the pace of their relationship. What will happen to the pair when Haruka begins to question his senpai’s feelings?

A collection of short stories:

1. Only You
Accused of being a molester, Mochizuki gets saved by the gentlemanly Nagakura, and their friendship begins...

2. Only One
Following his divorce and subsequent loss of his apartment, Mochizuki moved in with Nagakura though they've barely been together for two weeks. A problem soon arises when Nagakura's colleague, Hayami, appears on the scene. Apparently Hayami is an ex-student of Mochizuki's. Just why has his appearance caused a sudden rift between the two lovers?

3. Yasashisa no Kyori (The Gentle Distance)
Having grown up with a pair of brothers from next door, he slowly discovers his attachment to the younger brother... Could it be love? And what is this niggling feeling he feels for the older brother?

4. Mousou Prize! (The Delusionary Prize!)
Shino has quite a crush on his cute tutor Akio. Akio promises Shino a reward if he can do well on his mock exams but what kind of reward is the student expecting? Will the tutor be forced to pay up?

5. 17-sai no Paradox (A 17-Year-Old Paradox)
Kuroe is annoyed by his always-smiling teacher, Mizushiro. "So you treat all your students equally? So annoying!" Kuroe passes his boiling point and decides to take action in this ardent and thrilling school romance.

6. Extras
Mizushiro tries to get Kuroe to say those magic words.

*Note: On most manga reading sites, the chapters have been uploaded separately. If you want to read all the chapters, you have to search for them one by one. The only missing chapter is the 3rd.*

From Blissful Sin:

Rintarou is bothered by the throbbing of his heart caused by his tutor, Kaede for unknown reasons. One day, Rintarou finds out that he's actually in love with Kaede when he was receiving H punishment! But, without knowing Kaede's feelings, Rintarou became anxious and..?! Little sadistic home tutor x natural high school student's after class love.

Includes the following short stories:

V.1
Chapters 4-5 Complex 17
To everyone Kouki is pure, innocent, good-looking, and well-mannered. But in front of Nao Miharu.?!

Chapters 6-7 Koi no Hajime wa xxx!?
What does Amekawa Chitose have to do to get Nijyou Sensei to believe him.

V.2
Chapters 12-13 Yuuutsu Trickster (Melancholic Trickster)
When host, Hayase, wakes up one morning, he finds himself in his neighbour's Akizawa house and from the moment he ate his cooking, Hayase felt attached to him. Then one day while Akizawa was sleeping, Hayase plays a prank on him and is paid back with a forceful kiss?!
Bangai-hen/Extra

V.3
Chapter 15 The prequel to Koitomo!?

There are also 2 Special Booklets
Special Booklet #1 Shows a bit of Kaede as a child and his viewpoint on toys.
Special Booklet #2 Just what will Rintarou do when he gets lonely because Kaede's has been neglecting him?

Volume 1
From Blissful Sin:

Ever since his mother passed away, Hinata has been taken care of by Midori, who is as strict as he is caring. Midori’s smart, and tall, and handsome. He also doesn’t have a shadow or a reflection in the mirror. Wait… What? Hinata’s a scaredy-cat, and thinks Midori might be a ghost. But he is in fact a…?

Volume 2
From Exiled Rebels Scans:

Midori has taken care of Hinata ever since his mother passed away. Midori has finally "exchanged” with Hinata, but will these two newly weds finally have the time alone to enjoy their honeymoon? Or is there something Midori is hiding from Hinata still…?