Just in case some newcomer strolls along deviantart and stumbles on this, and because I want to....Here it comes...
Spyro was born into a family of dragonflies. He grew up believing he was one. Eventually, he discovers he is a dragon from a far away land. He quickly meets Ignitus, an elder dragon, who sends him out to defeat Cnder, a massive black dragon....A slave of the Dark Master's. Spyro defeats Cynder and rescues her from Convexity.
Ashamed by her past, Cynder runs away shortly after. Attempting to find her, Spyro runs into the chronicler, who explains that the Dark Master is Malefor, a purple dragon, much like Spyro. He became too powerful. He was sealed in Convexity. Gaul, the ape king, and leader of the Dark Master's forces is trying to bring Malefor to the dark realms. Spyro tracks him down and kills Gaul. When Spyro becomes overtaken by the darkness, Cynder rescues him. Suddenly, the area begins to collapse. Spyro saves himself and Cynder by encasing themselves in a crystal for 3 years.
3 Years later, Spyro and Cynder are found, imprisoned, and given energy shackles, forcing them to always stay nearby. Hunter of Avalar rescues them. Eventually, Malefor begins to try to destroy the world with a massive creature called the Destroyer.. Spyro and Cynder fail. Ignitus sacrifices himself to get Spyro and Cynder within walking distance of Malefor's lair. Cynder manages to stop Spyro from turning dark again and going to search for Ignitus. Eventually, they reach Malefor, defeating him in an epic battle. Malefor tries to destroy Spyro using Cynder, again. He fails. Afterwards, the Destroyer finishes his cycle, causing the world to fall apart. Despite Spyro asking Cynder to leave, she refuses. Spyro, boosted by this act of confidence, concentrates his energies and rebuilds the world. As it happens, you can hear Cynder say, "I love you."
We know their lives continued onwards, because at the last cutscene, we see Spyro and Cynder flying around a grassy field.