That’s basically what happens when your 3D mind interprets the telepathic energy of unconditional love. When the telepathy is strong enough and both twins are gifted, they can actually get across the feeling of being touched, kissed, or caressed. In telepathy twin flames can feel sensual touches like the warmth of an embrace or kiss because one twin is visualizing what they want the other to feel.
The hot upper body and heart palpitations - this is the heart chakra activating. Heart palpitations are one of the most common twin flame body sensations and you’ll hear people talk about them a lot:
The pressure you feel on your lips could be the telepathic kiss experience. The energetic bodies of twin flames are always in contact as part of the soul bond. The sensations can range from gentle fluttering to intense pressure. It sounds like you’re pretty attuned to your twin and picking up on their energy clearly.