Haru visits Canada to spend the summer holidays in the woodland house of his strict, strong-willed mother, Haruko. There, she burdens him with the responsibility of caring for his younger adoptive brother - a wild and unruly little boy named Ren who trusts no-one and prefers to wander in the woods with Haruko's dogs rather than associate other people. Haruko orders Haru to 'civilize' Ren. As the young man strives to teach Ren how to live in human society, their relationship gradually improves - so much so that Haru plans on taking his 'little brother' to Japan with him once he finds a job.
Unfortunately, fate has a cruel habit of interfering with one's plans.

Marco, a boy who admires healers who support warriors and heals all. In order to make his dream come true, he enrolls in a nursing school, "San Castello," which specializes in training healers. However, when he entered the school, it was a world where females were 90% and males only 10%! And what's more, contrary to the fun school life he hoped for, this school has various courses which will put his own life at risk!
What fate will fall upon our plucky protagonist is...!? A little naughty struggle featuring the sweat and tears of a shota aiming to be a Healer!!!!

A healthy lovey-dovey, but secret, relationship between a Gyaru and a Shota.

The Koyomi Family once ruled the underside of Japan. Now in ruins, the young heir Kashitarou Koyomi remains, all by his lonesome self. Starting up in solitude and having to live with the anger and grudges of others, a self proclaimed caretaker and tutor appears, introducing herself as "Nazuna." It is here, she proclaims, "I will raise you to be a great man of evil!"

This is a story about a mob ojisan who, one day, suddenly becomes the heroine of an otome game.

TL/N: Mob in this case means NPC instead of gangster

From Chibi Manga:

Ai loves cute things and chocolates. She feels she has become closer to her sempai. And when she was about to confess her love to him,...something happened...

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.

Summer Vacation.
Every year Kouhei looks forward to the growth of his cousin, but the first meeting after a very long year he sees that his cousin had extended his hair into a ponytail.
Because of the ponytail and casual look his cousin begins to look like a girl...
Everyday life with a tanned pony-tailed shota!

A boy moves town, a friend of his mother with a strong Kansaiben accent takes care of him.

A yuri manga told from the younger brother's point of view.

A story about hiring a maid who turned out to be a gyaru.

Translated with the artist's blessing by Rotoscopic.: https://twitter.com/rotoscopic

Also translated without the artist's blessing by Going Places.

Links:
Creator Pixiv: https://www.pixiv.net/member.php?id=25533
Creator Twitter: https://twitter.com/saiso_

A slit-mouth woman encounters a young boy she's unable to scare.

She wants the D but more specifically the Orc's D, but she only finds a d and is waiting for it to become a D

A touching story following the life of a boy with a round penis.

A countryside boy meets a gyaru from Tokyo. Naturally, it paves the way to one shota.

A former nursery teacher to a death game company!? A struggle to the death with a super-rich, genius and cheat-like young man begins...! A clumsy 4-Koma death game comedy manga!

He is suddenly looking after a child of the devil king? Their story which is a little shameless!

Saeki Kazuko is an ordinary otaku who has a thing for "two-dimentional shota" but somehow, she is being bothered a lot by a neighbor's child named Aikawa Ryuou, an elementary school boy who looks like a Yankee but pure by heart. Even though he earnestly approaches Kazuko, he show it with honest feelings and partly some violence.

Most of these stories are teen boys with teen boys. The exception is story #2 this is an older teen (at least) with what looks to me like a pre-adolescent boy.

1) The Letter From Canada
2) Love Is Pure, Desire Is Maternal Affection!?
3) Like Or Love
4) Be Honest…

Shinya goes to live and take care of with his two younger cousins, Tsubasa Fujisaki and his younger brother Subaru, after their parents go overseas. However, Shinya is surprised to find both cross-dressing upon his arrival.