In heat apocalypse, I Rely On My Orc Husband To Survive

In my previous life, my sister and I discovered two eggs.

From one, my sister hatched an ice serpent, while I brought forth a fiery phoenix.

My sister, however, took away the phoenix I had nurtured, not foreseeing the impending catastrophic heatwave apocalypse.

As fate would have it, she was consumed by the relentless heat. Before her demise, she manipulated my ice serpent husband into murdering me.

Unexpectedly, we were both reborn on the day the two eggs were to hatch.