When Mercury and Venus sit in the same part of the sky in your birth chart, the way your mind moves and the way you love are not two separate systems. Mercury, the planet of thought and speech, and Venus, the planet of taste and attraction, act as a single thing. What you find beautiful, you also want to talk about. What you love, you think about carefully. What you think, carries warmth.
The conjunction means the two planets share a sign, so they also share an element and a way of operating. An air sign blends ideas and connection into something graceful and sociable. An earth sign makes the blend practical and sensory: you know what you like and you can say exactly why. Fire signs push the whole thing outward, fast and vivid. Water signs make it intimate, with words that reach further than their surface meaning.
Because Mercury is never more than 28 degrees from the Sun, and Venus is never more than 48 degrees from the Sun, this conjunction always happens close to your Sun. That means your thinking, your taste and your sense of self pull in broadly the same direction, which tends to produce a coherent personal style: what you wear, what you say and what you admire tend to tell the same story.