I work at a small packaging plant in the shipping department. There are only 4 of us that work the department including my boss. Sometimes we get hot orders in that require us to stay past our shift getting them ready to shipped the next morning. Normally I don't think much about staying late but just last week we had one of these late orders come through and my boss asked us to stay. I told him I couldn't because my husband's car had broke down and he took my car. He was going to pick me up at quiting time. My boss said he would give me a ride home, so I called my husband to let him know. We had finished up and the other 2 clocked out to go home leaving just me and my boss in the building alone. He told me it would be a minute as he still needed to file the paperwork for shipping company. I sat quietly in his office as he typed away on his computer. As he worked I couldn't help but notice the large bulge in his pants. I had never noticed that he was well endowed. I trying to see just how big it was when I looked up and saw him looking directly at me. I had been busted but tried to play it off saying I was looking at a bug under his chair. He didn't buy it and said If I wanted to see it all I had to do was ask. I laughed and acted like I didn't know what he was talking about. He said to let him know if I changed my mind. I couldn't help it and asked if he would really show me if I asked. He said of course, so I said let's see it then. He stood up, unzipped his pants, and pulled both his pants and boxers down to his knees. OMG it was big. Bigger than anyone I had ever seen before. He went to pull his pants back up and I stopped him. As I reached to stop him I accidentally brushed his p****. Not expecting to have touched it I pulled back and apologized. He asked if I wanted to touch it and without answering I reached out and grabbed ahold of him stroking it a few times. Then I leaned in and took the head of his p**** into my mouth. I couldn't get much further than the head. It was big, I had both hands on it and my mouth. I stood up and pulled my pants down bending over his desk. He rubbed my v***** a few times and then plunged his p**** inside me. My God it felt like he was stabbing me with a knife. He was deeper than I had ever felt before. I swear to god it felt like he was in my stomach. I tried to push him back because it was a little painful being that deep, but he pushed in further. I let out a whimper and begged him to stop going any deeper. He promised he wouldn't go any further but made the comment that he had a couple more inches left if I wanted it. I told him no I couldn't take anymore. He started to pump me from behind and although it felt amazing it was also painful. I wasn't sure if I would get off because of the pain so I reached down and started rubbing myself. I was getting hot and I knew I was about to c**. He must have sensed this and started going faster. The faster he went the closer I got to o*****. I let out a screaming o***** as he plunged his p**** all the way inside me. The pain was excruciating but we were both c****** and there wasn't much I could do. It had felt like his p**** was in my chest. I begged him to pull out after we finished. It was so amazing and painful at the same time. I pulled up my pants and excused myself to the bathroom. I tried to clean most of his c** out and found that I was bleeding. Not a lot, but enough that I put in a tampon. After I returned my boss drove me home. Later that night my husband was hinting around about s**, but I told him I had just started my period.