With each passing moment she slowly felt more and more like a part of him, an integral half to a previously incomplete soul. She'd been talking about soulmates before. He could certainly see how that term could fit the two of them now. The bliss and euphoria of moving against one another, of filling and building up that mind blowing friction. It was beyond anything Natsu could describe so he did didn't. Instead he dove straight into it, nipping sharply at Lucy's throat again to leave another short term mark as he started going harder after he felt her legs try to lock him in place against her.