Britney McMasters' MORFS universe
When a space mission with equipment developed by Synergy goes wrong, she feels compelled to investigate. So with her friends she goes on a mission herself.
This is the story of John Pitzer and Nancy Griffin as they go through life as young adults in a society which has reverted to an Old West culture as far as guns are concerned. They form a bodyguard service while still in high school and continue to live as bodyguards after they graduate. Their major activity turns into protecting against kidnappings, but they have many other adventures, too. 17 chapters.
A story in the Karinaverse (Traveller) Universe
After losing her virginity in a surprising quickie with her best male friend (also a virgin, and boyfriend of her best female friend), young Karina takes the opportunity to arrange a month of afterschool sex lessons with said male friend to make him better prepared before he has his first time with their other friend. Set in a variant universe of the Traveller RPG, more than 3500 years in our future.
Born and raised on the colony world helped to shape Drake. Losing both his parents only helped him learn more about the world. When Sara and Jen came into his life he used that to save them and bring them home.
A squad of combat soldiers are betrayed and used as bait. Years later the only survivor is still trying to find peace. The one responsible for betraying his squad is trying to come back and other senior officers need the survivor out of the way.