Don't call me Onii-chan anymore. she's my girl "

――Humans, commonly known as “dogs”, have been bred for the benefit of society.
However, at some point it became treated as a negative legacy of society...

Himuka who helped Mikoto who was trafficked as her pet, and decided to welcome her who had nowhere to go as her younger sister due to "her family agreement"!
At first, she poured her affection into her family, but Himuka, who had been watching over Mikoto as she grew up beautifully, became vague as to the boundaries between her siblings.
A male instinct cannot be suppressed! "The more you endure it, the more the sexual relationship accelerates..."

Sweet H story of a doting & carnivorous brother and a covetous sister