Hard mode: Post a title and let other anons come up with the plot

>be MC
>have best friend
>the whole series is about you and your best friend's gf fucking while trying to avoid being found out by the best friend

Little Sister Blackmail

My Dick Can't Possibly Save My School

A Loli is My President

Cafeteria Wars

Imouto and me play wrestling with uncle

>My Dick Can't Possibly Save My School
>Okurasu Otoko was just daydreaming during his class when suddenly he hears weird voices coming from nearby, when he takes a look in that direction he sees 2 demons talking to each other close to his childhood friend. Even tho he though he is hallucinating for a second, as nobody else was hearing or seeing those things, he listens and hears their evil plans to impregnate every woman in school with the anti-christ and then after 9 months have him kill the entire population of the school after which they would move to another public building and repeat as many times as they wish. Fortunately for our hero he also heard them talk about how to stop the anti-christ as if a woman has both a human child and the anti-christ in her womb then both of them will cancel each other out and so comes Okurasu's quest to impregnate every single girl in school.

So much could be done with such a title.
First thing that came to mind however would be a sort of negative version of Kami no Shizuku, where instead of wine the protag has to taste a range of poisons.
Why must he do this?
Dunno. Mystery. Maybe the world will end or some other ominous shit.
He has to build up a tolerance and taste 13 different poisons (and survive) to achieve some goal.
The end.

私の妹は私をレイプした!!

>Hardest Mode:
The letter I found in a glass bottle.

it is really ruining his life if it let him know he was getting cheated on?

Hard Mode

>Imperialis