That Time I Was The Summon

(This story will be a Slow Burn, With a bit of light rpg elements.) He was summoned to another world to become a hero. There was just one problem. Marcus Wright wasn't summoned to be the hero… Kind of?  He was summoned to be someone's summon. A former Marine, engineer, and self-proclaimed nerd, Marcus thought his biggest problem was figuring out what to do with his life after leaving the military. Then, one ordinary night, he opened his eyes beneath a sky filled with endless stars and found himself standing before a goddess. She gave him a choice of what he wanted to be summoned as.  Marcus chose the dragon. Now known as Vexentoth, a True Dragon with an absurd connection to magic, Marcus is dropped into the world of Vaelenor as the summoned companion of a young mage who has spent years being mocked and ridiculed for belonging to the weakest magical class in existence: Summoner. Together, they are about to discover that being a Summoner isn't nearly as simple as everyone believes. Their journey will take them through enchanted kingdoms, monster-infested wilderness, ancient ruins, dangerous dungeons, noble estates, forgotten secrets, and places where magic can be just as beautiful as it is horrifying. There will be monsters. There will be magic. There will be greedy nobles, ruthless bandits, betrayal, friendship, danger, and more than a few people who would happily kill them for what they possess. And somewhere beneath the wonder of Vaelenor lies a darkness neither of them understands. Marcus didn't want this life. His summoner wanted to prove that her worthless class wasn't worthless after all. Neither expected to become the beginning of something much bigger. In a world where monsters can be summoned, sometimes the most dangerous thing you can summon... is an Overpowered American.