The contents of this self-destructing note:

(click only one)

Link 1: https://privnote.com/Kczq2LDQ#nmqHpo0OE
Link 2: https://privnote.com/yBeJR4kb#nnLR19xNk

(Its the same message, each can only be read once, so only a maximum of 2 people can see it, and I of course know what it is)

There Perfect.

(At least until whoever that site admin is views the logs)