Ano Ko to li Koto

A 2011 Hentai manga series written and drawn by toruneko, Ano Ko to Ii Koto is a collection of light-hearted erotic stories involving couples. The stories are the following:

New Year's Play: A boyfriend tries to climax inside his girlfriend at the strike of midnight of New Year.

Yarizurai desu Natsume-senpai: The title character has problems about panting loudly during sex, and wants to show her boyfriend she has trained herself enough that they can have sex anywhere they want.

MKG!!!: Kobayakawa got his first girlfriend, but she had an ex and he wants to prove as soon as possible he is superior to him.

A Certain Countryside Highschool Girl's Melancholy: Yoshimura lets a high school girl stay on his house every evening on Wednesday. And one evening, she wants him to acknowledge she is no longer a child.

Konna Mune Demo Aisaretai!!: Takita is a girl with seemingly pretty large breasts, but her classmate Ookoshi suspects if that is really true. When he reveals his suspicion, she grabs him, throw him into a corner, and ask him why he thinks that.

Motto Dokidoki shite mo Ii no yo!!: Takahashi is part of the manga club but his most recent idea, that he was very confident about, got rejected. His senpai tries to help him him in makes his manga more "exciting".

Bosom Buddy: Oono thinks having a relationship where he can rub his face against a girl's breasts is just enough for him. Fellow student Mori offers him that, but he as to be the manager of the girl's volleyall club.

Ippai Taberu Kimi ga Suki!: Nishimura gives his classmate Takamura food constantly. Takamura wants to know if he does it because he likes her.

I Know, I'll Practice with My Little Sister: Ami's big brother wants to have "sex training" before his first offline encounter with his online girlfriend. With Ami, his blood-related sister.

Shiawase Setsuyaku Keikaku: Salary man Sakurai accepts an interesting proposal from shop worker Yoshioka for them to economize money. And discovers she wants to not waste more than just rent money.

Sentakumono ga Machikirenai!!: Taro Nakamura discover that female laundry worker Kurata, who he thinks it's very cute, is using his clothes for some very unholy pleasure. This leads to her dirtying his shirt and for Kurata an opportunity to sink into her obsession.

Serialized by Comic Sigma.

Tropes used in Ano Ko to li Koto include:

A-Cup Angst: Takita's primary motivation to pad her breasts.
A Date With Rosie Palms: Kurata is discovered red handed doing this while smelling Nakamura's clothes, by the man himself.
Bait and Switch: The beginning of Shiawase Setsuyaku Keikaku leads the reader to believe Sakurai is gonna force Yoshioka into having sex with him, but it's actually him waiting for the clock to strike at 9 PM to get a half-prince lunch box.
Breast Expansion: Portrayed in a realistic way when Takita reveals her breasts grew at the end of Konna Mune Demo Aisaretai!!. After all, she is still a teenager going under puberty, and the growth seems to take a couple of weeks.
Brother-Sister Incest: In I Know, I'll Practice with My Little Sister, Ami's older brother begs her for "sex training" so he can properly please his online girlfriend in their first offline encounter, and after she says to him he has to win a game with her, several incestuous sex acts between the two happen.
Buxom Is Better: Takita invokes this trope on Ookoshi to ask what he thinks of women with small breasts, before revealing she indeed have small breasts as he suspected.
Fake Boobs: Takita indeed pads her breasts.
Flung Clothing: Played for Laughs. Ami's brother takes off his clothes and we only see them after they already hit the ground.
Going Commando: Teased by the unnamed female character of Motto Dokidoki shite mo Ii no yo!! towards her kouhai Takahashi, but untimely averted as it turns out she was wearing bloomers under her skirt.
Happily Married: Implied to be end for Yoshimura and Kazumi at the end of A Certain Countryside Highschool Girl's Melancholy, since she is his housewife.
Making Love in All the Wrong Places: Natsume and her boyfriend have sex on a emergency staircase.
Modesty Shorts: Takahashi's senpai of Motto Dokidoki shite mo Ii no yo!! teases to be panty-less, but reveals she is actually wearing them.
Perverted Sniffing: At the beginning of Sentakumono ga Machikirenai!!, Kurata is caught by Nakamura sniffing his clothes, while masturbating.
Potty Failure: In Yarizurai desu Natsume-senpai!, the title character ends up urinating when climaxing.
Running Gag: In Shiawase Setsuyaku Keikaku, Yoshioka constantly mentions ways of economizing things and tries to avoid waste, culminating into an implication she wanted to have kids with Sakurai to get tax deductions. And to not waste sperm.
The Immodest Orgasm: Deconstructed. In Yarizurai desu Natsume-senpai!, the title character actually trains herself to avoid it so she and her boyfriend can have sex, because the noise attracts unwanted attention.
Who Wears Short Shorts: Ami wears them before quickly taking them off to show her panties while masturbating her brother.
Wise Beyond Her Years: Kazumi tries to pass off as this so Yoshimura can leave her at the bus stop, but he isn't convinced and try to call the authorities before she convinces him to give her shelter.
Your Cheating Heart: Invoked but in a defying way in New Year's Play, where the male character wishes for Shouko to not cheat on him.