You have a strange effect on this person, mentally. When you're together, your thoughts, ideas and conversations take on a deep sort of intensity -- you might talk about life's larger complexities, such as sex and death, or the intensity could come out in the way you treat them. You might try to dominate the conversation, or even your partner's way of thinking -- especially if things veer toward small talk.
There are too many big, life-and-death issues to discuss to waste time chitchatting! Your lover is interested in these intense conversations as well. If you have an idea that's abstract or otherwise complicated, they're able to give it rational expression. Sound complicated? It is! Your effect on each other is profound; this person could understand you better than you've ever been understood by a lover, and you could move them on a deeper level than they've ever been moved. You give access to each other's deepest, most complex thoughts. If you were to end up working together on a business or creative project, this is a really advantageous connection, because it allows your partner to access the depths of your ideas and bring them out to light. Even in your day-to-day interactions, you feel the effects of this pull between you. You broaden each other's horizons by introducing subjects the other might never have considered before. If your relationship has any issues to solve, this aspect may help with that, as it encourages you to talk things out in a serious and thorough way.