Not to defend the trolls in this, but I can say without reservation that Chris likely did this of his own volition, coercion be damned. We've all seen what Chris has done in the past with no input from others (shecameforcwc) so it's not exactly a far cry for him to take advantage of a lone, elderly woman with no way to protect herself.
Even considering the fact that Chris has done some positively wild shit under the influence of trolls in the past, I don't think any weens would be depraved enough to talk Chris into fucking Barb.