Merits and Faults of Intriguing Alien Biology
[http://archiveofourown.org/works/454765/chapters/781172] - - public:opalsong
Karkat's first experience with human biology leaves him quite interested and a tad bit more obsessed with humans and their weird, creepy body than he would like. He also has no qualms in showing that. Dave will never be safe again. Karkat/Dave, written for the kink meme.