The Circle of Chippai Life!

This documentary-style manga follows a Far East Silver Wolf girl who is captured by a large tentacle creature in a forest. The creature forcibly uses her body as a living host for its reproduction. It stimulates her breasts to produce milk and implants its eggs directly inside them. Over the course of a week, the eggs hatch and the young feed on her milk to grow. Finally, the offspring burst out of her breasts, completing the creature's parasitic life cycle.