Two stories involving Kyon and Koizumi:
First, Kyon finds himself in a nurse's outfit with Koizumi sitting on top of him and there is only one thing to check when in that position.
Then, Kyon and Koizumi try on some girl school uniforms and some sex toys.

English

The Melancholy of Haruhi Suzumiya

BOY♂ MEETS BOY♂

Blazblue

BREAK BLUE MERCURY RISING

BREAK BLUE STRAY CAT

Kantai Collection

BROKEN DIAMOND

K-ON!

Baby sitters

Baby sitters 2

Mikasa can't sleep and goes to see Eren, the she is forced and rescued by Eren and they finish having sex.

Attack on Titan

Baby-Making Practice with Eren !

Idolmaster

Backstage Hibiki Challenge

Naruto

Bakuchi Butai Gambler's Stage

Original Work

Bakunyuu Gegera

Bleach

Bankai - Unohana Kuzushi

To Love Ru

Bathroom with Momo!

Batsu o Kakugo no Shinken Ren'ai!

A shy but eager cheerleader decides to cheer up her "injured" boyfriend in a special way.

Because I'm Cheering For You!

High School DxD

Benigami Oppai Princess

For some reason, Sakura decides to wear a naked apron for Naruto, which entices him to pounce on his incredibly busty prey.

Best in the Village!

Shinon asks if Kirito's avatar is really male, so he shows her first hand what his male avatar can do.

Sword Art Online

Beyond the Prediction Lines

Big Sis Lil Sis Love

Big Sister Little Sister After

A boy saw Yuu peeing outside. To make it even, he'll let her see him pee as well. Though it didn't just stop there.

Browse all 'Happy Sex' Doujins

Happy Sex is often searched together with

Read all 1,116 Happy Sex Hentai Mangas