Your wish is my command
Definition 1 of 1
Pro Tip 1/3Servitude Tone
This phrase can imply that the speaker is ready to serve like a loyal servant or genie. 
As you have helped me so generously, your wish is my command.
Pro Tip 2/3Humorous Obedience
Often used in a playful way to show you're willing to do something for someone. 
You need more coffee? Your wish is my command, oh caffeine queen!
Pro Tip 3/3Exaggerated Compliance
Can be used sarcastically to show you will do it but find the request a bit much. 
You want the whole report by tomorrow? Your wish is my command.