Walk in and take a seat on the bed.
From Create Your Own Story
Slowly you open the door and slip inside as the lovers on the bed continue their lusty make out session.
It isn't until you actually sit down on the bed that Stacy even looks up from her son. Once she does see you she breaks the kiss, "Steven?" Stacy asks astonished. "What are you doing here?" You smile.
"I decided I'll be spending time with my daughter on the road," you say, "so I can spend some time with my son right now." Your wife smiles back at you as you sit. Stacy takes Timmy's shirt and starts exploring his chest and belly with her tongue. You get rock hard watching your wife move over every inch of your 9-year-old son's exposed torso and in his tiny little moans and gasps of pleasure as she does so. You reach in your pants and whip out your cock to start jacking. You wife follows suit with Timmy's. You're now watching her stroke his little member, well maybe not so little. You suppose you should congratulate yourself on passing down an impressive early size to your little stud. Stacy must like it as well because she can't wait to get it in her mouth. Your whole body tenses up briefly as your cock twitches.