Monday came and we were busy as usual at work. I would come and go daily. Always leaving to get supplies or materials. Shortly after lunch, I planned ...o leave to go get some materials and planned to stop by my house to teach my mother in law a lesson on taking responsibility. After I had made my errands, I drove out of town to my house and parked in the garage. I went to the back door of the house and gently knocked before coming on in, to avoid startling Tammy. Tammy came towards the kitchen. "Enough to make you cum a few times, I think," replied Richard, who now pushed his bulging crotch against Marcie's arse. Marcie turned and they kissed, long and lovingly, as they anticipated the night ahead."I think that I should have your cock out of your pants now, young man," said Marcie as she undid Richard's jeans.She dropped to her knees and slowly lowered his jeans. She massaged his bulge and cupped his balls through his underpants and Richard tensed and Marcie giggled. She then slowly. I could make out her large nipples through the fine material. With a coy smile on her face she said, 'I need to take a shower, won't you join me." And with that she opened her robe and let it drop to the floor. I could no longer hide my attraction. My sleeping erection came back to life immediately. My heart was racing and words were not finding their way out of my mouth. She led me by the hand down the hall to her bedroom and the master bathroom in there. Once inside she turned. I began moving towards them, shocked at how oblivious everyone around was. By the time I reached where they were, in the bathroom, he had pressed her against the wall, not bothering to go into a toilet stall, and was fumbling with her dress. I didn't even look at her, but I heard her protesting against his "advances", which he reacted to by raising his fist...I lunged into him from the side and pushed him off of her. She collapsed on the floor, but I didn't have any time to go over to her..