They smell fear
Han Xin's gaze was intense, his eyes darkening with unspoken desire. He wanted to touch Xiang Yu, to explore every inch of his skin. His fingers itched to trace the lines of the dagger, to feel the texture of Xiang Yu's skin under his touch. As his fingers lingered on Xiang Yu's neck, he imagined how it would feel to run his thumb along the length of the tattoo, feeling the soft hair at the nape, and then down to the sensitive skin of his spine.
Xiang Yu, unaware of Han Xin's inner turmoil, tensed slightly at the touch, his body responding to the subtle caress. Han Xin's fingers were like an electric current, sending shivers throughout his body.