My Best Friend and His Wife Ask Me to Be Their Sperm Donor

My two really close friends invited me over one afternoon and sat me down in a very serious manner. They explained that they had been having difficulty getting pregnant, and can't afford IVF treatments, so they need a sperm donor. Since they have known me forever, and trust me, they ask ME TO DO IT. At first I am extremely nervous, because I have always thought my best friend's wife was hot as fuck. I do agree, and we move to the bedroom where we run into the first problem. There is NO WAY my dick is going to fit in her tight pussy without lube, which we can't use. So now her mouth is wrapped around my cock, and you can tell she is getting into it. We then proceed to fuck in multiple positions because she can't seem to make up her mind (and is enjoying it WAY more than she was supposed to). All the while my best friend, her husband, is watching as I pound away at his wife and fill her pussy up with cum. I became a sperm donor, and her husband became a cuckold.