Non-native speaker here. Why could this be understood as a cuckold joke? (My dictionary says this about cuckold: "The husband of an adulteress, often regarded as an object of derision.")
Because "Your home? I've found that they can make whatever I want..." suggests that _qhtn is in the habit of getting breakfast at douche's home (and can get "anything I want"!), and that douche doesn't know this.