This is a ,straight and gay fanfic with three parts: part one is gay, 2 is straight, 3 is gay again. I'm bisexual, so I'll post gay, straight and bisexual fanfics as well as porn pics, the pics won' be mine btw,all credit goes to the original artists.
As for the story it is between a Lucario and his Trainer who both developed special feelings for each other, but kept them hidden. Until after winning the Pokémon League, where Lucario told his Trainer about said feelings, the Trainer, named Johnahan, accepted and reciprocated them, and well, they have a steamy sex session together, making their bond grow stronger.
Read for part two description:
Lucario is droped off at Sarah's house by Johnathan, who has to go to the League of Champions meeting, little does John know, Sarah has other plans for Lucario...
After the League of Champions meeting Johnathan and Lucario have some steamy, kinky fun.