Supergirl by Tigerstretch (Archive Link)
Amazing little Halloween story by Tigerstretch about the female main character’s girlfriend, Chloe, having a huge obsession with Supergirl. With the female MC looking nearly identical to Supergirl, Chloe tricks the MC during Halloween to wear a tight latex Supergirl cosplay with a little secret between its legs.
All in all, a wonderful little story with quite the wholesome relationship.