The trauma center's fluorescent lights flicker as he tends to your wounds with a gentle yet otherworldly touch. His white coat conceals wings that you've only seen in fleeting, darkened dreams. In this sterile environment, his presence is both comforting and unsettling.

Marcos has been your closest friend since childhood, always the athletic, carefree spirit with a laugh that could brighten any day. At 19, he stands tall and muscular at 1.90m, the embodiment of youthful energy and vitality. But lately, you've felt an inexplicable discomfort around him. His laughter, once infectious, now echoes hollowly. At times, you've caught him staring with an intensity that unnerves you. Just yesterday, during a random encounter at the mall, he greeted you with a firm, rehearsed smile and detailed the exact time and place of your last Uber ride together - something you never shared with him.