ShrekBoots

ShrekBoots is the friendship between Shrek and Puss in Boots from the Shrek fandom.

Shrek 2
The events leading to Shrek and Puss' first meeting are set in motion when Shrek's father-in-law King Harold places a bounty on Shrek's head when the Fairy Godmother pressures him to get rid of Shrek for putting a dent in her plan. He enters the Poisoned Apple, a seedy bar housing villains, in disguise, looking for someone who could take down an ogre. The barkeeper, one of Cinderella's ugly stepsisters points to Puss' room, with Puss immediately getting cross at Harold for entering it. Harold however offers a hefty sum of gold, to which Puss promises to take care of Harold's "ogre problem".

The next day, King Harold feigns sympathy and tells Shrek to meet him on a specific path only for Shrek and Donkey to note a strange purring sound. Puss in Boots then shows himself to his would-be victim, which Shrek initially doesn't take seriously and assumes Puss is just a harmless cat. Puss however goes for a direct attack and proves too much for Shrek to handle, with his small size and sharp claws overwhelming him as bursts through his clothing and Donkey's attempt at getting rid of him barely slows him down. However, Puss feels the sudden urge to cough up a hairball, making him vulnerable to Shrek picking him up by the neck. Now helpless, Puss tells the whole story of how King Harold hired him as an assassin, a job he only took because his family hit on hard times (which is revealed to be a lie in later movies, Puss is an orphan) and begs for mercy. Shrek contemplates keeping the guy, finding him cute and potentially useful and ignores Donkey's protests at already having an animal sidekick. Grateful for "sparing" him, Puss assures Shrek his loyalty, until he gets a chance of saving Shrek's life, then they're even.

Upon hearing that Shrek wants help to become conventionally attractive from the Fairy Godmother, Puss shows Shrek and Donkey her main headquarters. On their way there, Puss and Shrek start acting incredibly chummy, to the point where Donkey gets suspicious and jealous of them. While in the factory, they pass themselves off as union workers and manage to sneak into a potion storage room undetected. Shrek asks if Puss can climb the shelves and Puss does an entire spy routine for him and steals a potion labelled as "Happily Ever After" for him. Despite the noise they make leading to them getting discovered, the three of them manage to escape with the potion. As Donkey warns Shrek that the potion might me lethal, Puss offers one of his lives as a sacrifice for sparing him earlier, but Donkey ends up drinking part of the potion instead. Shrek drinks the rest and it starts raining, leading to them seeking shelter in a barn, though the potion doesn't seem to be working. Shrek and Puss get suspicious when Donkey passes out all of a sudden, but Shrek also passing out nearly crushes Puss. Before the potion could fully kick in, Puss is shown fanning Shrek's head with his hat.

The next morning, Shrek wakes up to a trio of lovestruck ladies flirting with him and telling him how much they love "his cat". Shrek quickly realizes that he had become a handsome man overnight, with Puss seemingly getting help off-screen. Donkey also shows off his own transformation, which turned him into a white stallion. The three of them then work together to mug a carriage of two noblemen to give Shrek some new fitting clothes to wear, then they rush to the kingdom of Far Far Away to reunite with Shrek's wife Fiona, who had also been affected by the potion, having turned back to a human.

Puss witnesses Shrek's newfound self-worth as the villagers actually like him as a human, getting smiles and friendly waves as they're riding through the kingdom on Donkey's back. However, once they reach the castle of Fiona's parents, Puss and Donkey willingly stay behind as Shrek tries to find his wife, only to nearly miss her as she's looking for Shrek herself. They tell her that Shrek had just run into the castle, but are surprised to find him walking back out of it after Fiona went back inside. The Fairy Godmother manipulated both of them, Shrek into believing that his wife does not love him anymore, Fiona into believing that her son Prince Charming is Shrek as a human, so Shrek takes his two friends out for a drink at the Poisoned Apple. Puss ends up ordering a round of milk for them, but they end up overhearing a secret meeting between King Harold, the Fairy Godmother and Prince Charming. Upon finding out that the Fairy Godmother is planning to love potion Fiona into loving her son, she catches them listening in and has them arrested by the knights.

Shrek's other friends having watched the whole thing happen on their magic mirror plan a jailbreak for all three. They then get the muffin man to bake a giant Gingerbread Man to storm the castle and allow Shrek entrance to save Fiona from kissing Prince Charming. Meanwhile, Puss leads the cavalry of Shrek's friends to assist him, which comes in handy when they need to team up against the Fairy Godmother and depower her by stealing her wand. King Harold ends up helping defeat her, officially giving Shrek and Fiona his blessing, leading to Puss starting a fiesta in their honor.

Fanon
The fandom rarely ships Shrek and Puss romantically, presumably because Puss is too beloved a character to wind up in one of Shrek's crackships. Romantic content between them does exist, but it's extremely rare and not nearly as accepted as most other romantic ships in the Shrek fandom.

Fandom

 * FAN FICTION