and b) Non-sexual.
Whatever you think of, is what a fluffle is - it's different for every person.
One of the more common interpretations is hugging someone and ruffling their hair.
* Cameron gives Kate a good fluffling.
The usual physical analogy is a ruffling of someone's hair, though in the medium of text-based electronic communication, the term does not require physical form and remains equally valid as an abstraction.
Indeed, at the very highest level of abstraction, a fluffle not only need not have a physical analogue, but need not be directed at a specific individual. Used in this way (3), fluffling becomes a general outward radiation of affection.
2) Random_Player > Fluffles to all :)
3) * Unfree fluffles