Cat grooming itself. Cats often lick other cats as social grooming or to bond (this grooming is usually done between familiar cats). They also sometimes lick humans, which may indicate affection. Oral grooming for domestic and feral cats is a common behavior.
Purring: One of the most common and well-loved signs of a cat's affection is purring. Cats purr when they're content, relaxed, and feeling affectionate. A cat purring while in your lap or beside you is expressing its comfort and trust in your presence.

Adult cats often retain this behavior, particularly when they purr. The Feline Smile. People often consider purrs to be an expression of affection, and it is a communication tool. Cats and kittens rarely purr when they are alone. Purrs are aimed at other cats or people.

This particular example perfectly highlights why Cat Purr Indicating Affection is so captivating.
A cat purring on top of you is one of the most relaxing states in which we can find ourselves. The low hum of their contented purring benefits both cat and guardian, with the simple fact of spending time together encouraging their bond.

Positive cat tail body language includes small twitching, slow swishing, or a neatly tucked-in tail alongside relaxed body language and/or purring, a tail straight up in the air as they greet you, a tail wrapped around you, or a hook shape indicating affection, happiness, or play time.