Batman and Robocop: The Day The Men Found Love

Batman: "There is a way to extract your memories before they know everything?"
Robocop: "Yes, but it will involve your masculinity."

Batman And Robocop: The Day The Men Found Love is a crossover fanfiction by Comics Nix.

Bruce Wayne finds his cousin Oliver brutally murdered while on a trip to Detroit. With the apparently corrupt police force unwilling to assist him in tracking down the killer, Bruce finds an unlikely ally in the form of RoboCop. As the title suggests, the two end up finding more than answers in their quest for justice.

As a typical Comics Nix fanfiction, the story features incredibly disturbing sex scenes, a nonsensical plot, horrendous spelling, and an eery charm.

Tropes used in Batman and Robocop: The Day The Men Found Love include:

Biggus Dickus: Robocop's 8 inch mechanical penis, which is MISSING!
Closet Key: Robocop is apparently this to Batman.
Crack Fic
Crossover Ship
Dirty Cop: The Detroit police force is said to be corrupt, and the fat cop Bruce Wayne first speaks to refuses to help him.
Everyone Is Bi: Both of the title characters appear to be bi, since Robocop states he's been with whores, and Batman was stated to be an "anal virgin", implying he's had sex with a female before.
Everything's Deader with Zombies: It turns out Oliver's murder was part of a plot by an evil group of hippies to create a zombie legion.
Gross-Out Show
Hobos: Batman and Robocop have sex in a warehouse usually occupied by hobos; they were only mentioned, not actually seen, because they were busy "making orgies and drinking hot beer".
Hoist by His Own Petard: The hippies are eaten alive by their own zombies.
Lemon: To be expected, though, given the title.
New Age Retro Hippie: Averted. While their descriptions and some of their dialogue implies that they're the stereotype hippies, the group that killed Oliver do not act like hippies at all and don't use the typical hippie dialect.
So Bad It's Good
Troll Fic