My senpai is super-hot, super-popular, and a super-model. Rumor has it that he always invites his target to the library and ravishes that person right there and then…
Which is why I was totally shocked when he suddenly asked me to join him at the library!?— I’m ecstatic!!!
My body is already burning in anticipation—!
Written under the name Kaou, Saeko.
(Source: Fantasyshrine)

A pair of lovers from two neighboring schools is separated by a wall of fence.

TO BE DELETED. CORRECT LISTING HERE: https://kitsu.io/manga/shichakushitsu-no-midara-na-shinshi-novel

The handsome hope of the Sales Divison, Ichijyou, discovers that his superior, Supervisor Kirihara, has a body which is too erotic. Since Kirihara hasn’t had sex for the last 10 years, he is agonized by a body reacting to the slightest touch. “This is my first time with such an erotic body... Amazing... It's like the whole body's an erogenous zone.” While Ichijyou is being caught up by the innocent reactions of his supervisor, he is already drowning in that lusty body?!
(from Blissful Sin)

Kitagawa gets confessed to by the popular, Yamamoto. Taking advantage of the situation, he accepts and they start going out. But, Kitagawa has a secret that he would die before letting Yamamoto know about... Can their relationship work out, or will the secret be exposed?!
(Source: Girls' Generation Scanlations)

Jun loves women and their bodies, but finds himself watching a fellow male classmate after seeing him being molested on the morning train to school.

A story about the relationship of a man and his adopted un-identical twin sons.

A guy who just moved to Tokyo from the countryside meets a beautiful neighbor who works at a night bar.

From Yaoi Desire Revolution:

Nao, the introverted prodigy of the department, trembled upon hearing the handsome Kouji, who has an inseparable relationship with him, discussing his problems. The thing is Kouji is an ass “hunter” who can’t stop feeling sexual arouse when seeing beautiful ass? After devouring almost all of the girls in university, he began hitting on Nao, who has a beautiful round ass despite being a man!

This book includes the following stories:

1) The Cafe Called Love

2) Suki Dakara Itte Hoshikunai

3) Urge to Molest

4) Spring Comes to the Cafe

"Aren't you always thinking about that guy?!"
An arrogant Bakeneko (cat monster), named Kuro, is taken in by ordinary honor student Noeru. Kuro however leaves Noeru alone in a classroom after turning him into an erotic beauty with his powerful ero-magic.
Things get complicated when he ends up sleeping with cool guy Shouei, the person he's secretly in love with! The dutiful honor student becomes a lusty boy... Erotically sweet and troubled high school days ensue!
(Source: MU)