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Sly Smile Kaomoji
Nosebleeding kaomoji — click to copy, then paste anywhere text works.
The eyes are a cat-like shape with a lazy, half-lidded look, and the mouth is a small, crooked curve. The nosebleed is conveyed by the sly, mischievous posture, implying a character who is amused by their own thoughts. This fits a message hinting at a secret or a playful scheme.