How to Think Up Characters for Sequels

They’re a classic triangle,
Each point in love with the one
Point that’s not in love with it.

It works for them, a circuit
Around which love goes smoothly,
Bump to bump to bump, like that,

Never resting or going
Backward. The whole triangle
Rotates through the northern sky

All winter, but if you look
Up without a triangle
In mind, you might see a kite,

That lonely fourth point on top.
Ah, dimmer, lonely fourth point!
But that’s another story.