My wife works in a sperm bank and loves her job! Se is a really sexual person but because I work shifts I don't see her for ages and she is gagging for it when I see her. We are trying for a baby right now so have to shag as much as possible but iv not been able to for a month given my shifts. Anyway my wife had an assignment to collect sperm samples from an old folks home as part of a study into sperm analysis in old men. She has a special machine that's like a vagina that the old guys put their cocks in and it wanks them off into a funnel then a big jar. She had put about 25 old men though this machine and had about half a pint of sperm when it broke down. Shit there were still 2 old men to get samples from who were waiting with erections. Ok though my wife I will let them shag me then pull out and cum into the jar at the last minute. The first was eighty odd with a small wrinkly cock. She pulled her dress aside then her pants, explained he was not to cum inside her and straddled him. His cock parted her pussy lips and slid easily in. She was wet already at the thought of how wrong this was. The old boy started to reach climax, don't cum in me she said, ok I won't he stammered. Ah ah fuck he shouted as she rode him faster. He could feel the silky sides of her 25 year old fanny grip his cock and her juice spill out of her. Then he shuddered and shot his cum deep inside her. It was a massive load and my wife leap off him and grabbed the jar to catch the cum still leaking out his cock.. I told you not to do that!!! My husband and I are tring for a baby!!! Next!! She shouted. The next guy was already listening through the crack in the door and was in the room in a flash, already naked! He was in his nineties and before my wife could do anything he pushed her over the examination table. Woo steady on there are rules you can't cum in me! I will decide he growled. No you don't understand my husband and I are trying for a baby I'm not on the pill. That thought pushed him over the edge and he came in her doggy style. Letting his cock stay in he said sorry got a bit carried away! Oh well never mind my wife said iv got a strangers load in me anyway! If you want a baby iv an idea the old man said. He grabbed a big syringe from my wife's medical kit, took the needle off and plunged it into the jar of semen pulling it all up. What are you doing my wife said? Lye on your back the old man said, ok she said and started to get the idea. Open you legs and fanny lips he commanded. He then pushed the Srynge right up her into the neck of her womb. Ready he said? Do it she said! He pressed the Srynge and the full half pint of old man sperm flooded her womb searching for her young eggs to fertilise. My wife told me this tale 3 days after it happened before we made love. She had instead a special sperm cap to keep it all in. It was rock hard as she told me this tale whilst straddling me naked. Her tits were big and ripe and her tummy did seem bigger thn normal, I guess that was that sperm in there. She pulled the plug out and the half pint of sperm flooded out over my cock and balls. It was strong smelling and really sticky, it couldn't hold back and shelved myself in and came in her within 30 seconds. A month later she has missed her period! Must be an old mans baby! She still works at the sperm bank and gets more business the more pregnant she looks!