This might be counterintuitive, but... lose some weight?
Hear me out - we tend to lose visceral fat more quickly than subcutaneous fat, so losing weight might help you reduce your hard fat and make your soft fat a bit more noticeable?
That's my unscientific, non-dietician best suggestion, though. I know that it doesn't quite provide a solution to your actual request, as it is less "adding" fluffy fat than it is "accentuating" it.
That said, you can also try upping your dairy intake - I've read a few scholarly articles that have been posted in these forums that seem to indicate that dairy fats tend to accumulate at a greater percentage of subcutaneous fat than do other types of foods.
Good luck!