My ex confesses that her daughter is my half-brother's

Well, first and foremost, if you've read my stories about how I shared my girlfriend with her ex, I'm warning you that the protagonist of this real-life story that happened to me is not the same girl, it's a different one. Fine, so in 2022, I met a girl through a youth outing from a church, where I was invited, and there I met her, whom I'll call Débora. She was with her boyfriend, who had been together for just a few months. She told me she was single and didn't have contact with the baby's father. We hit it off quickly and managed to see each other another day. We kept seeing each other on different days, I would pick her up after she got out of class and we'd chat until one day we decided to become a couple. Everything was fine until one day she confessed something that completely caught me off guard, which is that the father of her baby is her half-brother, the son her mother had with her current partner after divorcing Débora's father. She told me that on New Year's Eve, when everyone had gone to sleep and was drunk, she got up from her room and went to her half-brother's room, not knowing why, as she was pretty drunk so didn't know what she was doing. Once inside the room, she ended up in bed with her half-brother and one thing led to another and they had sex three times that night, twice ending up in my pussy and the third time already a little semen ended up in her mouth, and before everyone woke up she went back to her room like nothing had happened. She got pregnant and told her family so they wouldn't make a big deal out of it, saying that the father of the baby was a boy who didn't want to take responsibility and wasn't around anymore. She told me that during the pregnancy everything was normal, although it was uncomfortable and weird living with her half-brother who had gotten her pregnant, but everything went smoothly. But after giving birth, when her hormones were starting to regulate... and lost control, my half-brother went at it with her again, but this time with a condom and not drunk. That confession left me confused, I really didn't know what reaction to take, so I just consoled her because she felt bad about those things that happened. The truth is that after the confusion, the next day when she came to visit me at my house, I told her details of what she had told me, and right there he said how many times he comes and stuff like that. She was with the baby, who was in the stroller, so I gave her a couple of toys and turned the stroller around looking the other way; then I pulled out my cock for Débora to give me a blow job, I was really hot after everything she had told me, afterwards I started taking off her clothes until she was naked in front of me, seeing that 18-year-old body, imagining her being screwed like a slut by her half-brother made me go crazy without any previous play or use the word: pussy I opened her legs and fucked her like the slut she was, while doing it I told her she was a slut, that I would talk to her half-brother so between the two of us we could give her cock and cum all night like she deserved. And apparently this really turned her on more because my fluids were soaking the sheets with each thrust. Just before cumming I pulled out, took it to her mouth and finished later in her face. Unfortunately the relationship didn't last long so we never got to do a threesome with the half-brother, but I don't doubt that after ours he went at it some more times with that girl slut.