Here are a few idioms that might prove useful.
I had to "rope him in".
This means you persuade someone to do something they might not volunteer to do.
People can say this in a joking way to close friends.
For example, "Sorry I had to rope you into helping me".
Can I "pick your brains"?
This means asking for someone's advice, especially if they know a lot about the subject.
People can say this in a joking way to friends or even coworkers.
For example, "Since you are such an expert, I need to pick your brains about this building project."
I am going to have to "put you on the spot".
This means asking people questions even if they are awkward or embarrassing.
People can say this in a joking way to their friends.
For example, "I hate to put you on the spot, but could you feed my cat when I am away this weekend".
Hope this might help.