"Then She Wins" (a sequel to "When She Loses") Percy Jackson fanfic
The obstacle course is much more fun when you're facing off with a Cyclops instead of a bunch of whimpering newbies. And facing off with a Cyclops was about a million times more electrifying when you remembered that this Cyclops is your boyfriend.
Tyson smiles at her and hunkers over, fingers to the earth, legs bent, ready to bolt. She does the same, and shoots him a glare that isn't all that up to her usual standard. His dreads are pulled back in a weird topknot, and he's wearing exercise shorts and a blue tee and absolutely no shoes. It's sort of a tactic that she favors for the course. She tugs on her own ponytail absently, making sure it won't be flipping in her eyes when she beats him. Then she checks it again, then one more time, then slams her hand down on the dirt, because dang it all she is definitely not primping when she's supposed to be focusing on the course!
http://www.fanfiction.net/s/9708161/1/Then-She-Wins