Sharing

My sister just after her marriage she became sterile because of a accident and she's had no sex drive because of it and she confided in me being I was her twin and we are always close she asked if I would get pregnant by her husband and give up the baby to them and they would raise it as their own, well I thought about it for a few weeks.
We got together for dinner one night and we started in talking about it again and they agreed for me to move in with them, pay all my bills off, pay for all my medical and basically support me till the baby was born and put 15K in my bank account, that's how much they wanted a child, I agreed and for the next week they both helped me move in to the apartment they had built in the basement of their home just for me.
For the next two months her husband fucked me twice a day and I became pregnant with twins like my sister and I and they were overjoyed.
The sex with her husband and I continued till my 8th month and my doctor told me to quit so I did but he was still doing me analy which I soon began to love.
The babies were born and it's been two years now and they want me to go thru it again for them and again sex with her husband two/three times a day for the past three months and I became pregnant again, confirmed last week having a exam, again with twins.

Are you unable to get her pregnant?

As others have said, you really need to think this one through. Can you love, provide for, and nurture this child as if he or she were your own? If you and your wife do a lot of soul searching and you're sure, ok.

This happened to us, but it wasn't intentional. My wife had been dating other guys for years with my knowledge, and one month she missed her period. We knew for sure it wasn't mine, because I had been on the road during that time (musician). She didn't feel she could go through with an abortion, and seeing as how I knew everything from the beginning, I didn't feel I had the right to force the issue. We decided to raise the child as our own and we're glad we did.

If you insist on going ahead, here's my advice based on my experience. You'll want to make sure the bio father is not in the picture at all. You don't want any legal or custody problems. He should be a stud, nothing more. If your wife dates a number of STD free men during her fertile period, all the better. As soon as the baby is born, sign the birth certificate as the father. I don't know where you live, but in most U.S. states, the husband is automatically considered the father unless someone else challenges his paternity rights, so you shouldn't have any difficulties there. Always keep in mind, however, that a genetic test may need to be done on the child someday due to illness.

Once the baby is born, consider the child YOURS. You'll be uncertain and anxious at first, but if you help your wife care for the baby from day one, you'll bond with him or her, and in no time you'll be crazy over your son or daughter, just as if you'd planted the seed yourself. You'll be a dad like any other.

I once was going with a married women who told me she wanted to have my baby, fortunately she had a girl that looked a lot like her, did not see her after that

Unless you have a signed contract and even then it could be nullified the man that got your wife pregnant will have rights to the child. You are headed down a slippery slope with his one!