Elf Asks for Help: I ​​Will Hand Her over to the State

[Elves cross-border for help + surrender to the country + fantasy world + single female protagonist] Fan Xuan woke up from a hangover with an elf girl lying next to him. Leah traveled through the void to Blue Star and asked for military support from the Dragon Kingdom. Fan Xuan decisively surrendered to the country and planted the tree of life together. After a short journey to find seeds, the world of elves opened up. There is light, magic, and war here. As long as they are carbon-based organisms, they will be submerged under the fire. Not a heavy machine gun? And artillery! Neither can missiles! You force me to deliver express!