I'm sure there's a lot more of her out there. I found this one in under a minute with a simple Google search. We were discussing Rule 34 (If it exists in pop culture, then there is porn of it on the internet. No exceptions.) when one of the Esurance commercials came on, so finding porn of Erin became a challenge. All too easy.
comment #47484 Part of the reason it's so prevalent is that Erin Esurance was the poster child of Rule #34 for a while and everyone was making porn of her. So now a days it's much easier to find her than most rarer series.