Medical science grew by leaps and bounds over the years and my sterility was tested. The doctors concluded that I was fertile, but for some unknown re...son my wife (wives) could not conceive. Oh we tried everything, IVF, and donor carriers, nothing worked, my sperm all died trying to fertilize an egg. I knew nothing would work, but I tried for my mate's mental health.Occasionally one of my wives became pregnant. We both knew it wasn't mine. Most left me in shame, some tried lying, and a few. My mum knows i am playing my sister. She went to bed room and slept. My sister told me do the same I told we will go to bed room we went her bed room and closed the door. I remove her nighty. She told mum will know what will do, I told no problem i take care of that are you interested ,she agreed. I pressed her tender breasts and kissed .she call me for fuck, I fucked her, in the night three times we did . Morning mother and me went to school , on the way I came back to home. I saw my sister. My mind came back to reality. I had a full erection going on and it was pressing rather painfully against my pants. I could feel drops of pre-cum oozing out and it felt like I had reached the point right before ejaculation! Had the images of my naked mother caused this? I noticed my mother glance at the bulge in my pants. I quickly crossed my legs and acted normal. My mother cleared her throat. After about 3 hours of driving my mom announced that we had arrived. "Alright!" I exclaimed. ”She chuckles, “I like men who talk turkey but my husband's waiting. With dinner. Can you cook?”“So what?” he replies. “Fiancée's home too. Pregnant. Who will ever know? Just the two of us.”She rolls her eyes again. “Filthy pig. Get lost!”“C'mon!” he tries, bravado persistent. “Just a quickie. Five minutes, not even. He'll not even notice the delay. Can just say you took a short detour. Improving your cardio and stuff.”Her expression changes. Irritated. “So what's in it for me, then? You'll.