As a resident artist here myself, I can see the common sense and foresight in CC's decision. While drawing those types of pictures are of no consequence to me, they would be a liability to this site which is trying to follow regs so as to not become a blip on the scanners of the agencies responsible for reporting this sort of "crime".
The age of the voice actress of the character in question is irrelevant as the character herself is underage, and drawing her in ANY way that COULD be used as evidence of wrong-doing is a liability to this site, particularly to the owner, TT, who would no doubt bare the brunt of the legal offense with the rest of us as accessories.
Even though the chances of a worst-case scenario are limited, they are still possible. And one slip-up is one slip-up too many. All it takes is ONE ill-fated bad decision to ruin everything.
Trying to weigh the pros and cons of this topic is pointless as it is implying we should take these types of chances. The risk just isn't worth it, no matter how innocent the artist, and by extension, their art is.
We live in a world where people are looking to drop a dime, and would, in a second if they had a reason to. If theres some sicko deleting groups on yahoo, theres certainly someone among us waiting for this site to make a critical mistake.
We shouldn't afford this person, or persons a moment of opportunity, not now, not ever.
Personally, even without the danger of being reported, I don't particularly care for underage tickling that involves adults unless its carefully done and with no sexual undertones at all. So in all fairness, I can understand how and why this sort of thing is being watched by government agencies, and why they think the way they do. If I were in their position, I'd probably do the same thing. I think we all would. But we're not in their position, and its ultimately we who are responsible for discretion.