I told Pankaj about it and he readily agreed to the suggestion. The very next day he got an appointment with a gynecologist for the evening; she check...d me and then asked him to send his semen sample for examination. We came back home and angrily criticized the doctor saying that he knew his semen was potent enough to produce children, it was just a chance that conception is not there. I did not argue because I knew his nature, he would feel humiliated if test reports showed lower sperm count. " This only made my eyes bigger. Tina knew she had me going. She leaned back while riding me. She stuck her chest outwards and reached back to massage my balls. I wanted the moment to last and faught hard the urge to cum. I focused on Tina, moving one hand from her hip to her clit. I rubbed as she rode me. My intentions were good but not good enough for her. She moved my hand away and began rubbing herself with the hand that was fondling my balls. Tina ordered me to pinch her nipples. I did so.. Since she was too old I would I knew she coudnt get pregnant but the thought of my father starting life in the same canal she pushed my father out of, made me smile.After resting for a moment, I pulled off her and lay on the bed beside her.Then gave her nipple a quick kiss .Still shaking I stood up and admired my work… Her legs wide open exposing her gaping hole now overflowing with her grandsons hot milky white fluids… Her lips still wide apart and that motherly hole gapping almost. His free fist rose to knock harshly. ‘Open the fucking door, now, Madi.’ His tone was as harsh as his knocking. ‘Leave me the fuck alone.’ He growled, kicking the door. ‘Open the fucking door right fucking now. Don’t make me take the hinges off, I’ll fucking do it Madi.’ He heard the bolt being pulled and the door opened. ‘Who the fuck do you think you’re talk-‘ Her sentence ended abruptly, as though someone had ripped the sound right out of her throat, her mouth left hanging open as stared at.