If something is suffusive, it spreads through or fills a space or thing completely.
Suffusive is usually a good thing, making people think of warmth, happiness, or comfort.
Examples:
The suffusive smell of cookies filled the kitchen.
Her suffusive laughter filled the room.
The suffusive light of the sun filled the whole sky.
The suffusive joy of the party made everyone smile.
The suffusive love of the family made the house a happy place.
The suffusive warmth of the fire made everyone feel cozy.