Neptune aspects are known for its deceitful nature. I honestly believe that Neptune aspects in synastry can harm us even more than difficult Pluto aspects. Neptune rules unconscious and his pure energy is very spiritual. But it is its highest manifestation which simply cannot be reached with difficult aspects. When it comes to difficult Neptune aspects in synastry, what Neptune here represents is the area of illusions, delusions, deceptions and lies.
A half-truth is a whole lie
Thing is that Mercury person is the one who will receive this energy. Neptune person can be the most kind and loving person in his own life but in this interaction it is really him who is doing all harm. There is usually lot of suspiciousness on Mercury person´s side. Interaction begins – as with all Neptune aspects – very idealistically. Mercury person is really impressed how knowledgeable Neptune person really is. It really seems that Neptune has all the answers to Mercury person. So it is very easy for Mercury person to start idealizing Neptune. After all – Neptune always came with best solutions to Mercury´s problems so it is so easy to trust him.
But let me tell you. If something seems to be too good to be true, it typically is. There will come a day when Mercury starts to be a little bit mistrustful to Neptune´s person motives. Mercury will start paying attention to little lies that Neptune throws at them here and there. Mercury will start question intentions of Neptune person. Confronting Neptune person may not be the best idea as Neptune is the smartest with words – after all. This interaction can be damaging to Mercury person. Problem is that Mercury person is so deep in this entanglement that is quite difficult for him to trust his guts.
Usually there are real lies and deceptions which Mercury person experiences in this interaction. Neptune person can lie about everything but if you want to have it more specifically – check where is Mercury´s person Mercury in their birth chart, in which house and aspects to Mercury will be areas that Neptune person´s lies about. If Mercury is in the 5th there will be lies about being faithful but Neptune will flirt with other people and will be hooking up as well. Mercury in the 2nd house? Neptune will lie about their income and here is another danger – Neptune can use Mercury to their advantage in Money matters. Mercury can very well end up supporting Neptune person´s financially.
I mean, if you have this one in synastry in tight aspect then you have to be careful. Too much Neptune can literally destroy you. One day you will find yourself broken and spiritually damaged because you have trusted someone who turned out to be very opposite to what you have expected them to be.