Master and servant, man and wife
Unintentionally but not entirely by coincidence, both happen on the same night.
At almost the same moment, Tom Riddle touches Severus Snape's forearm with his wand, and James Potter slips a ring on Lily Evans's finger.
Two breaks in one night for a bond that had snapped long ago on a sunny lawn by a glittering lake. Two dramatic gestures to sever a tie that had been cut with a single word.
Both think, at the same moment, of a time many years ago when she had grabbed his arm in fear. His right arm. Her left hand. They both knew long ago the gesture would not be repeated now.
The only question that remains is this: if she had done it tonight, would the livid tattoo on his arm burn her more than the cold gold of the ring on her finger would sting him?