Real-time gaze interaction involves the interplay of multiple eye parameters, yet their distinct and complementary functions remain poorly understood. In this study, we examined eye behavior of 25 dyads using a nonverbal dyadic paradigm with asymmetrical partner roles. One partner (listener) heard emotion-inducing auditory stimuli and experienced the evoked emotions, whereas the other (observer) attempted to infer the listener’s emotional state solely through gaze. The observer neither heard the audio nor knew its timing. Masks and a partition confined visible information to the eye region alone. The experimental protocol unfolded across three temporally structured phases: baseline (fixation on cross), audio (mutual gaze during emotional induction), and silence (continued mutual gaze post-stimulus). Our analyses revealed that fixation, blink, and pupil parameters primarily reflected role-specific and phase-dependent processing demands rather than emotional valence. Blinks marked distinct attentional priorities for each role, with interpersonal blink synchronization decreasing when partners' attentional goals diverged, demonstrating attentional coupling as a prerequisite for coordinated blinking. Fixations showed shared attention allocation across roles, characterized by active visual exploration during mutual gaze phases. Pupil dilation indexed phase-dependent arousal and cognitive effort, particularly pronounced in observers. These findings show that advancing our understanding of real-time gaze communication requires modeling the eyes as an integrated system where fixations, blinks, and pupils serve distinct yet complementary functions in dyadic interaction.