First time sucking

I was staying at my mums brother in laws farm working to help mum out. I enjoyed it and she got some cash to help with the bills. Times were hard since my dad walked out on us when I was just three. Now sixteen I was more then happy to help out. My duties where to clean the house then feed and clean out the ducks and chickens before making uncle Bob his packed lunch and taking it to him where ever he was on the farm land. Bob went for his tea and a couple of pints to the local bar ten minutes drive from us so I fended for myself of an evening. On a Friday Bob walked to the bar and had tea and a lot of beers so I was always in bed when he got back. One Friday I heard him come home, stagger up to his room before going downstairs again. There was some strange music playing and some moaning going on so I investigated on from the landing. There on the tv was a porn film with two guys serving a woman whe was in sexy lingerie. I started to rub my erect cock and must have moaned a little when I saw Bobs head start to turn. I dashed back to bed waiting to see if I'd been caught but Bob never came up. I had a very stiff cock so started to wank off to the thought of the video. Soon I shot a load of hot spunk over my tummy, legs and bed sheets. I would clean up in the morning. Next day I took bob his lunch and he asked if I slept ok last night? A little nervously I said "yes fine" he grinned and carried on working. The next Friday after he went out I searched his room for the videos and after finding one draw full of his wife's lingerie ( she passed away four years previously) I found them. Putting one on I settled down to watch. Straight away my cock was rock hard and after stroking on and off in between changing cassettes I shot a great load of hot sticky spunk all over the place mmmmm. This went on for a further two weeks unlit one Friday I decided to investigate his wife's lingerie draw. I put on some nylons and suspenders, silky black panties and a silky black kami nighty. Sitting down on the sofa I turned the video on and started to stroke vigorously.i got so carried away I never heard the door open or Bob come in! I got to climax and shot four streams of spunk in the air and over the stockings mmm. As I got up to clean up I saw him standing there with an astonished look on his face. " I' I' I'm sorry uncle Bob please don't tell mum and send me home. He said in a stern voice" sit down" I did as I was told dreading the consequences. To my amazement he told me he wouldn't send me away or tell mum if I would do a favour for him! "Anything I said". The video was still playing and the two guys had finished with the woman and one was stroking and sucking the other guy off. Bob nodded to the video and said " the same as them!" I reluctantly agreed and he took off his trousers and underwear reviling a semi erect fat cock. It was seven inches without being hard! "Here you are " he said and Inbent over and started to stroke him. After a few moments he got fully erect and my god it was big. It must have been ten inches and I couldn't wrap my fingers fully around it. Then he pushed my head onto it and thrust it half way into my mouth. I gagged a little and he moaned. Then he pulled me fully of the sofa onto my news and fucked my mouth in rapid time shoving it almost all in before pulling it almost all out. I looked to the side and saw in the mirror my reflection, I was still in the lingerie and the image turned me on a lot. It seemed like ages of him fucking my mouth when his cock jerked and stiffened before shooting stream after stream of hot salty spunk down my mouth. I was on the verge of passing out when he eventually let me pull off. I had to swallow half of the spunk of I would have choked but managed to catch my breath before most of the rest dribbled down my chin. His cock was now semi hard but still had the odd twitch and dribble of spunk. I cleaned up and we both went to our beds without speaking.