I think these two won't melt into each other. Just as Aquarius and Libra won't melt into each other. We're ruled by different signs. Venus and Mercury are markedly different, and their way of presenting themselves are as well.
The way they connect is through the intellect. (Venus yields, of course) They have an instant rapport with each other. However, gemini is more mentally ambidextrous in the sense that they juggle many topics in the same conversation, sometimes to purposely divert the course and confuse the scales.