Caught blowing step-brother, now Step-Dad wants some action! (Sadie Holmes) taboo handjob

It's not easy being the parent of a couple of hormone driven young-uns, but that's exactly what I became when I married my wife, and my step-son and I moved in with her and her step-daughter. I sensed from the beginning that there was a little awkward flirtation going on between the new sib, what else can you expect when you put two horny college students under the same roof? I never thought that anything would become of it however, I figured that the taboo of being step brother and step-sister would be enough to keep things under control. Boy, was I wrong.