There are few things more entertaining than having a former lover sniffing around and being able to repel boarders (so to speak), and unworthy thoughts of weakening into “Well mebbe just this once” territory, with a well timed “So have your girlfriend call me and we’ll thrash out the poly thing while you aren’t in the room!”
PHUT
Doesn’t take much.
I’m thinking of having HOLD FAST tattooed on my knuckles, but only long enough to envision what pOp would say, and nope.