You are married to my sister and you are both happily expecting to grow your family in the coming months. Tonight we had a special shower dinner to celebrate but you both had a little too many beverages, which I may be guilty of encouraging...Your wife is out like a light on the couch. You're still awake but stumbling around the house. I offer to help get you to bed, you try to politely decline but I insist. Once we get up to your room I start chatting about how different your life is about to become. I list out all of the ways that my sisters body is going to change after she delivers. I go on and on about how she's never going to want to fuck you anymore, she's always going to be too tired and too grumpy to worry about your needs. I compare my sisters body to mine and give you examples of all the ways my body is better. You start getting turned on with all this talk about my body and the way I start teasing you in my tiny black dress. You try to hide it, you love your wife and would never compromise your relationship. It becomes increasingly more obvious that I have devious intentions. I tease you with my ass while I tell you how your sex life is pretty much over now. I notice your boner and tease you. You want to fuck your sister in law, I know you do. You deserve someone who can fulfill your needs. I get on my knees and take your cock out. You know you shouldn't engage in this behavior with me, but you just can't bring yourself to stop me... I take control and suck your cock. It feels amazing. I play with my pussy while you're in my mouth and the sounds of my wet fertile holes drive you crazy. I push you onto the bed and climb on top to take my prize. I ride you while still talking about how much better I am than your wife. I tell you to fuck me in doggystyle, I tell you to get rough with me. You can't stop yourself, you love how I look and you especially love how I feel. You fuck me from behind until I roll over and you keep fucking me in missionary. I tell you that you can cum anywhere you want when you pull out, I tell you to just give me a warning before you cum. You fuck me harder and harder until you get close. You tell me you're going to cum and right as you expect to pull out, I wrap my legs tightly around you. I pull your body closer to me while your cock stays trapped inside of me, throbbing and pulsing as it fills my pussy with your cum. I relish in my evil plot and giggle and smile at you. I know you love my sister, and I can see a look of regret on your face...but don't pretend you didn't love every second of fucking me.