All 3 Uses

paramour
in
Interview with the Vampire
(Auto-generated)

And Claudia, the crowning jewel, a fairy queen with bare white shoulders wandering with her sleek tresses among the rich items of her tiny world while I watched from the doorway, spellbound, ungainly, stretched out on the carpet so I could lean my head on my elbow and gaze up into my paramour's eyes, seeing them mysteriously softened for the time being by the perfection of this sanctuary.†
Part 3
But now Claudia has released you, yet still yon stay with her, and stay bound to her as your paramour,' he said.†
Part 3 *
'No, she's no paramour of mine; you don't understand,' I said.†
Part 3

Definitions:

(1) (paramour)
a lover -- especially with a partner cheating on their husband or wife
(2) (meaning too rare to warrant focus)