You'll find your next KEY and LOCK in your messages with the MESSENGER. You'll find your KEY and your LOCK at the start of your mutual history, existing as the first two words she ever sent you. The KEY is the first and the LOCK is the second, but no need to make them conform to the pattern of the others, for they require no affixes.
.siht ekil hcum ,sdrow eht ot egnahc A ...deriuqer llits si evitcepsrep ni tfihs a ,sexiffa deen t'nod yeht fi nevE ..ti etiuq ton s'taht tuB ...trats eht ot kcab og ot deen ll'uoy ,oN ?...ti si ,ti tup ot ecalp doog a ton s'ereh tuB