I've experienced JUNO-JUNO conjunction and JUNO-VALENTINE conjunction.I also have Juno/Valentine conjunct natally.
In the case of the Juno/Juno conjunction, their Valentine was conjunct my Moon/IC which was loosely opposite our Junos.
Lets just say it was very intense (especially on my side) in terms of very quick loyalty, trust and then struggling with trusting the trust.
It's awkward because the amount that we care about each other is IMMENSE, but it was a lot of missed opportunity.
I should note, my Juno is also conjunct BML, and their Juno is also conjunct Neptune, so there was bound to be some kerfuffery.