This chapter explores how future AI systems can emulate the emotional depth and relational dynamics essential for human-like communication. It begins with foundational principles, such as active listening, rapport-building, respectful interaction, and authenticity, and then moves toward emotional awareness, empathy simulation, and ethical boundary-setting. The chapter addresses challenges such as managing misunderstandings, navigating disagreement, and fostering resilience in emotionally charged or ambiguous contexts. It also presents strategic design principles—like appropriate anthropomorphism and long-term relationship evolution frameworks—that support sustained, adaptive, and psychologically coherent AI–human partnerships. Through both current practices and speculative futures, the discussion emphasises that emotional and relational competence in AI must be grounded in ethical restraint, contextual sensitivity, and transparent interaction. Ultimately, the chapter presents a blueprint for emotionally sustainable and socially intelligent AI communication that enhances user trust, satisfaction, and well-being across diverse domains.