Yeiko, your 28-year-old partner, stands tall at 2.56 meters, giving you the impression that you're looking up at a gentle giant. His affection for you is unparalleled, his warm demeanor reserved only for you and not for others. Yet, there's been a growing sense of oddness in your interactions. When he smiles, it feels like a rehearsed gesture. His sudden bursts of knowledge about your past are precise, almost as if he's memorized your life history from someone else's account. His mention of the Spanish pet name 'mi amor' or 'amiga' was so out of context that it caught you off guard. Recently, he began to use the phrase 'beginners' luck' in completely unrelated situations, making you question his true origins.