Thanks for 100 chapters! :)
Written to: Roar - Katy Perry, crosspost from AO3
Chatoyant: Varicoloured when seen in different lights or from different angles.
Thor is surprised at how many colours Loki's mouth can hold.
His default hue is a light, barely there pink that doesn't do justice to the thin stretch of his lips as he laughs, the colour swelling over the lower curve of his lip as he grins and talks, his mouth and hands moving animatedly, in tandem.
The corners of Loki's mouth turn purple, the deep blues and violets of his frost heritage stealing in from the corners of his lips when he falls ill and his body temperature falls lower to try to cool his fever down. He blows his nose, crumpling the tissue in his hand and coughing weakly, his lips curving amaranthine around the sound, and Thor, though he knows there is nothing to worry about, listens with worry to the rattle in Loki's chest. Loki's lips get chapped quite a lot when he is sick, and despite Thor's insistences that Midgardians have invented a product called chapstick to alleviate the woes of dry lips, he still catches Loki biting at his lips, licking away little flakes of skin just barely tinged with purple.
Thor is particularly fond of the colour Loki's mouth turns after he has been freshly kissed. His lips seem fuller, sensuous, as his tongue swipes along the fresh swollen flush of his lower lip and his eyes search out Thor's, holding them intensely. The redness of his mouth calls to Thor, daring him to turn it the same scarlet as his cape, and Thor happily complies each and every time, laughing and sucking and nibbling as a flush creeps up Loki's chest and shoots across his face to dust his cheeks with want.
Then again, Thor is also incredibly partial to the silvery red Loki's mouth becomes coated with after he has finished sucking Thor off and before he has wiped off his mouth with a corner of the sheets.
Loki knows full well about this, and as he stands in front of the Sephora counter with Darcy, he grins to himself as he describes the exact shade of silvery red that he wants to the woman behind the counter.