The Communion Duet Ingest Me & Ingest Me, Too

Ingest Me
When Tristan's mother is pregnant with a girl, he hates his unborn baby sister instantly.
She was not part of the plan, nor was his mother's boyfriend. When she's born, Tristan loathes his baby sister, Evie, a sibling he never asked for and one who is inferior to him.
Early on, he learns online that women have one purpose: to serve men. Tristan develops a peculiar habit involving his sister, and while he works hard to become a proper Chad, his sister's mind is set on him and all he has to offer.

Ingest Me, too
With her big brother no longer there to feed her and the supplies he left behind running low, Evie has to find another way to satisfy her cravings.
After a particular incident, she learns that human flesh does not all taste the same, and she's looking for a specific flavor. No longer able to handle their daughter's outbursts, her parents decide Evie needs rehabilitation, and she's locked away in a facility.
Here, she meets a person who's there for her own particular reasons. However, she leads Evie onto a path that could possibly still her desire for human flesh, and Evie might just develop a new favorite flavor...

This is an extreme horror, consider this a warning to all TW. 18+