MC is reincarnated as a monster

Sadistic Military Man x Natural Airhead Horse A horse that reincarnated from modern Japan into another world and is enjoying the horse life in the forest got kidnapped by Commander Felix, a military person he had saved, to become his personal battle horse. The horse gradually opening up despite being worked hard by the sadistic commander, when a certain incident revealed his true identity………!?

"What the, why is my body so small and chubby?!"
A 999-year-old Imugi (lesser serpent), just one year away from ascension, is unjustly killed, and upon opening their eyes, finds themselves reincarnated as a 1-year-old hatchling.
A second life begins with all the memories of the past life perfectly intact. Slowly and completely, they melt into the unconditional love they are experiencing for the very first time…