We can never speak highly enough about Tombow Dual Brush pens. Use them in your sketchbooks, planners, letters, notes to yourself on your hand. Just use them.
A beautiful warm-toned limited edition set of Tombows that you could use to draw citrus...or flowers...or bright orange kitties....anything you want, really.
We were trying to find a good description of this product online, but they were all in French and the French know a thing or two about fine writing, so let's just trust that this is a quality product.