The Light You Never Should've Been Under

Cover art not mine!
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Lyney and Lynette.
Lynette and Lyney.
That's who they were, that's how it's always been.
You'd never hear one name being mentioned without the other.
Of course, they also have their dear Freminet, but the strength of magic twins' bond is incomparable to anything else.
So it's always been Lyney and Lynette.
Lynette and Lyney.
But what if one day that changed?