Disclaimer: These characters do not belong to me. I just like to mess around with them.
Mako touches her and she feels like she's on fire. He drags his fingertips lightly across the vast, bare expanse of her stomach and, God help her, she's shuddering. The Avatar, master of all four elements and the keeper of peace, has been reduced to a shuddering heap in the arms of a fucking pro-bender. It's pathetic, and if Korra wasn't so thoroughly distracted she'd have the decency to feel embarrassed about it.
Katara mentioned once that firebenders have higher body temperatures than most - Korra still remembers the telltale twinkle in her eyes, reflections of a hotheaded prince undoubtedly dancing across her memory - and she's pretty sure that it's irrefutable at this point. She's practically melting into Mako's touch, and where his hands roam her body burns in return.
Her eyes flutter as his fingers travel slowly south, below the waist of her pants, underneath the hem of her underwear...
Mako watches Korra with heavy lidded eyes. The corners of his lips are turned up in a small, contented smile. He loves Korra best when she's vulnerable and at his will. It makes him feel powerful, and maybe even valuable.
Because he, with a few quick swipes of his thumb, can bring the all-mighty Avatar into a state of pure bliss. She is raw, and aching for his touch, and God knows he needs to be needed.
He steadies his one hand on her hip, and allows the other to move lazily down to where he wants to be.
It's over quickly, because Mako is just that good, and because Korra is eager and greedy. She is, in the heat of the moment, the most perfect version of herself. She takes and takes and takes and when it's all over she gives back, too.
And so she starts with a chaste kiss to his collarbone.