https://www.dlsite.com/girls/work/=/product_id/RJ01071120.html
https://www.dlsite.com/girls/work/=/product_id/RJ01103254.html/?translation=RJ01103255&locale=en_US (English)
pixiv: https://www.pixiv.net/users/89139837
As always, please support the artist and buy his works.

Older Sister and Younger Brother

Having lost their parents in a fire when they were young, Haru and Yuu, an older sister and younger brother, have been living alone together away from any of their relatives.
Haru, the older sister, is bewildered by her younger brother's romantic feelings and unusual obsession with her, but ends up nonetheless in an intimate physical relationship with him.
The younger brother's obsession with his older sister is related to a memory from his past.

Contains:
* Incest
* Dub-con
* With the exception of the erotic content, the story is rather dark in nature
* Older sister x younger brother (sister is 2nd year college student, brother is 1st year college student)

Characters
1- Haru
Yuu's older sister. A second year university student.
She is bewildered by her brother's romantic feelings for her, but unable to reject them, she ends up in an intimate physical relationship with him.
2- Yuu
Haru's younger bother. A first year university student.
He has romantic feelings for his older sister Haru. He is abnormally obsessed with her for a certain reason.

CHINESE version: https://e-hentai.org/g/2866286/40ed46207b/

lil bro is a psycho

Base +7, Lalogeta -6, Instaburst +6, bronzeage +6, nanaya666 +6, The bonker +6, sadiadfssdfsdfsdf +6

Why'd he kill his mom too? He could've woken her up or something.

Base +2, metonhi1 +8, bronzeage +6, The bonker +6

Because then he could be with her without the mother interfering. She's not exactly going to let them get it on, is she?

Base +6, CyborgSamurai +6, gyropathic +7, Uninformed +6, sadiadfssdfsdfsdf +6

The mom can't be trusted to protect Haru. So she's a liability *_*

Base +6, Metuo +6, ExtremHol +6, Sohhhh +6, timeholder +6, nanaya666 +6, catpetter69 +6, Braltewrakcus +10, Aerasen +6, sadiadfssdfsdfsdf +6

Probably because the mom didn't stand up for his sister too. In the scene where his sister is being beaten the mom doesn't try to stop the father beating his sister,she just watched from the sidelines and told MC to not get involved. He might have seen her as just as culpable in the whole mess for not standing up for them?

Base +8, Fofotron +19, Sohhhh +6, Burning_Souls +2, nanaya666 +6, Yoi6 +5, catpetter69 +6, Leeksy +4, Aerasen +6, sadiadfssdfsdfsdf +6