I accidentally see Mom's ass... damn, I've got a hard-on!!

Don't worry, what's happening to you is more than normal, my dear. Your stepmother is none other than Mrs. Ryan Keely, and that's not a big deal, to be honest... so it's normal that you got a hard-on, and as you say, that lady is really hot, she has a tremendous ass, and on top of that, she doesn't turn up her nose at anything, so I wouldn't be surprised at all if she ate you out...