Title: Evolutionary Advantage
Fandom: Supergirl
Pairing: Kara/Alex
Word Count: 1046
Rating: NC17
Warnings: Explicit language and sexual content, sibling incest, xeno/non-human genitalia, fingerfucking.
Summary: When Kara sees Alex naked for the first time, she sees how different they are.
A/N: Written for the Annual Femslash Kink Meme, for the prompt "Supergirl: Alex/Kara, non-human sexual organs". Also fills my "Compare and Contrast" square for Gen Prompt Bingo.
AO3 Link:
http://archiveofourown.org/works/12985671