like, love, enjoy, joyful thing
憘 centers on a heartfelt positive inclination: liking, loving, or enjoying something, and the resulting joyful feeling.
憘 combines the heart radical 忄 with 喜 (joy, delight), suggesting a heart full of joy or fondness. The exact historical development is uncertain, but the component relationship is clear.
The heart radical 忄 beside 喜 (joy) shows a heart that likes and enjoys things, leading to a joyful state.
For キ, imagine a key to your heart that unlocks pure joy: key -> キ, and your heart fills with delight.