source from south-plus, uploaded and bought by Crestina

raw:https://www.dlsite.com/maniax/work/=/product_id/RJ250784.html

最后的台词，可怕

Base +7, zyl12345 +6

Summarized from the dlsite link:
When the protagonist and his little sister were kids, they saw their parents having sex. Curious, they decided to have sex with each other. As the older brother got older, he realized it was wrong. He got scared, so when he entered university he left his home to live a solitary life and run away from his sister.

Several years later, he hears about his parents abrupt death. The first thing he thinks about is his sister being left all alone. So he decides to return home for his sister. That night, out of loneliness, his sister sexually tempts him. He understands it's wrong, but he can't resist his sister's charms, and there is no longer anyone to stop them, so they drown in pleasure every night.

This author usually has some sort of twist at the end of his/her works, so here is a summery of the last 3 pages (92-94):
At the end of the work, when they're laying in bed and the older brother is sleeping, the younger sister thinks about how her parents should be glad that they died for such a cute daughter, and that she doesn't need them or anything else as long as she has her beloved brother. So it can probably be assumed that she killed her parents to get her brother to come back to her.

Last edited on 19 September 2019, 19:06.

Base +7