"I loved watching my sister's tits swell with milk as our baby bulged out her stomach. It made me even hornier for her, and we fucked at least two or three times a day!"
"Now all she has to do is press her breasts, swollen with milk, or her belly, swollen with our daughter, against any part of me and I'll be ready to fill her with more of my seed!"
"She doesn't dislike all her chores. She's happy to keep my baby-maker nice and clean with her mouth and drained of any back-up with her pussy!"
"She still takes naked pictures of herself, some solo (to remember the progress of her pregnancy) and some with the two of us fucking or my cum dripping out of her pussy (to remember how much fun we had getting her pregnant!)"
"One day the two of them texted me to come home quickly. When I rushed in, expecting that something was wrong, I saw them sitting with their friend. They revealed that their friend had figured out that I was the one who knocked them up since the three of us spent so much time together. I was about to deny it when my sister said "Don't bother. We confessed. But she'll keep our secret if we do something for her." Suspiciously, I asked "What?" Her friend stood up, pulling off her shirt to reveal her bare breasts. "Breed me too." was all she had to say. My sister and her friend made out as they watched me fuck a baby into their friend. Once she started showing, she introduced me to her (fairly wealthy) family as her fiancee. They gave us a big house as a wedding present and we graciously allowed my sister and her friend to live with us "because of their delicate situation." We're converting one of the bedrooms into a nursery, with plenty of space for more babies -- if any more of their friends figure it out and ask to join the "harem" we may need it!"
"Sounds good, sis! But you do need to be punished for making me use a condom in the first place, so before I flood your pussy with my cum, I'm going to film our pregnant sister taking your butt-cherry with a strap. Sound good?"
"Okay, sis, but I don't know if I'll be able to pull out, so I hope you're on the pill! What do you mean, 'what pill'? Birth control pills, you dork! Guess that answers the question of whether or not you're on them! Oh, and Mom and Dad are gone for the weekend, so don't think this is gonna be a one-and-done deal, either! So I hope you're ready to get knocked up!"
"I told her I didn't mind a bit. She also used me in answering other questions, such as 'What it feels like to have a gallon of cum blasted into my womb', 'What it feels like to have my ass fucked', 'What it feels like to have a gallon of cum blasted into my no-longer-virgin ass', and finally, the question it took the longest to answer, 'What it feels like to carry my brother's baby for nine months'."