(I suggest you read my earlier story "Impregnating Niece -- Four Surprises" first for continuity)
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My niece gave birth to a healthy baby boy and a couple of months after he was born I went to visit them. My niece and her husband were beaming with joy at the outcome of my impregnating her. Everyone loved the baby and commented what a good looking little guy he was. And he was growing well suckling his mother's milk.
My niece looked lovely as a mother. She had put on a bit of weight not too much, but her boobs had definitely grown. She was living at her mother's place in order to get some help with the baby. I was surprised when the mother came up to me and congratulated me. She told me that my niece had confided in her that I was the father of her baby. She said that she was happy that they had not gone with an anonymous donor.
That out of the way I was quite relieved. The next day everyone had gone to work except my niece and her mother. I was not able to greet my niece in the way I wanted, but now I got the chance. I gave her a hug and kissed her on her lips. Her huge breasts felt nice against my chest and I could not help but grab them and fondle them. I noticed that the moment I did this they began to leak milk.
My niece said that she was having excess production of milk and she had to continuously press some out to relieve the pain. I smiled at her and asked if she needed any help in expressing. She nodded. At that time her mother entered the room and she discussed the situation with her mother and her mother gave me a naughty look.
The mother was in her mid-forties but looked in her mid-thirties. You could tell that she must have had men chasing after her in her younger days. She said something to her daughter and she began to undress. Soon her lactating breasts were open for me to see. They looked amazing and both of the nipples had a drop of milk at the tip.
I went over to my niece who was sitting on the sofa and reached out and pressed her breasts. Milk spurted out from a dozen orifices in all directions. Fearing that the carpet and furniture would get stained, I took my niece by the hand and led her to the kitchen sink. I stood behind her and began to press out the milk into the sink. Milk gushed out of her breasts with every press. My niece's mother watched fascinated.
After five minutes of pressing I felt the time was right for me to drink from her breasts. I turned my niece around and led her back to the sofa with her mother following. I sat her down on the sofa and knelt in front of her. I remember that she had big nipples but now with the baby suckling they had grown even bigger. I began to lick her nipple and then run the tip of my tongue around her areola. The excitement was too much for her and she could not control the flow of milk which began to ooze out of her nipple.
I quickly covered her nipple with my mouth and began to suck out the milk. It was warm and sweet. The other breast was begging my attention so I switched breasts. In about ten minutes I had emptied both her breasts and my niece heaved a big sigh of relief.