Hmmmmm... It's hard to come up with anything specific with a basic premise, so I'll just toss out a thought.
Perhaps if you're having a hard time finding conflict between them, it's because the characters you've envisioned are a great team. You may want to bring in another character to serve as antagonist.
Good luck Danny Boy! There are several members here with writing and editing experience. They may have more ideas.
I hope you'll keep posting. These are fun questions! 😊
