Fics like ANATHEMA

Heat Death is a threat to any unmated omega. When Sonic wakes up in the middle of hibernation, he immediately realizes that something is wrong: he has gone into heat far outside of mating season. Having long since come to terms with how he would die, he sets out on one last adventure - a trek into the mountains to live out his final days before he succumbs to every omega's worst nightmare. But before he can reach the cave that he intends to turn into his final resting place, an unlikely hero comes to save his life.

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