Mark sat quietly on the edge of the bed and watched as I tied Em's wrists to the bedrail, and her legs so they were wide parted and nicely bent at the...knees."No, where's that lube?" I asked.Mark handed me large pot of something with glycerine in the name."It's what I use on the mares ... it doesn't harm the sperm," he whispered."You are so clever, Mark." I said and kissed him with just a little bit of tongue for being a good boy. "I think we're ready now, why don't you... ?" I motioned with my. She straddled my lap and ground her crotch into mine as she pressed her nipples into my bare chest. Her mouth attacked mine, and I was soon cupping one of those fabulous breasts in my hand.We went at it hot and heavy for a while, and then she rolled off of me, moving her head down to my chest. I squirmed as she took my sensitive nipple into her mouth, and then gasped as she slipped a hand under the waistband of my shorts and grabbed my cock.She looked up at me and said, "Take them off!"I. Let me tell you why this is so much fun! It all started when my husband was off early one morning on a business trip for a week. I had been really horny the night before and had tried to interest him in giving me a good fuck before he left. But he had been too tired, the poor baby. That really pissed me off. I had to spend twenty minutes with my favorite dildo that morning just to put myself in a good mood. As I was getting dressed I caught sight of myself in the mirror. I thought I looked. He decided to say, he didn't want to upset her, as he wanted more.'I am gonna cum,' he said a little silently, hoping she wouldn't hear, so he could say he did say, and he watched for her reaction. She continued, her head still rising and falling, taking his manhood deep in and out of her warm and welcoming mouth. His load continued to build, to rise and he felt it nearing the top of his manhood, collecting just below the helmet, the pressure building and his body tensing. Then unable to hold.