My sister fucked my ex

Yes, I know it sounds crazy but true. So, to start I need to clarify that she is not related to me by blood. In short, she is in the foster system and if you don't know what that is you could always google it. Don't be lazy. Anyways. She had moved in with my family around July of 2024 (I was 17 that year) Everything was going great, but I started to have this off feeling about her. 

Previously she had been staying with another family for 12 years and suddenly they "couldn't take care" of her anymore. They never gave us the reason, but I didn't want to pry further. I was just happy to share my room and finally have a YOUNGER sister (she was a year younger than me) since I've only had 2 older brothers. Time flies by, slowly she started showing her true side, she would often take my stuff without asking me and hardly returned them, or when she did return them, it would be in bad condition. I know this is weird to mention but she has a much bigger chest than me, and she'd try to wear my tops and clothes, even though they hardly fit her without stretching it. 

I was getting worried because I do own branded jewelry and I was scared she'd take them and lose it or damage it. I had spoken several times to her about this and she never listened. She started to self-invite herself to my hangouts with friends and make me pay for her. At first, I was alright with it but then she started to show my friend's attitude. Like bro, these are not your people. Then she'd try challenging me and try to fight me. Once she claimed that wired bras cause breast cancer. Obviously, with no sources proving her statement I told her that it was not true. She got upset and started threatening to search it up on google. Which I GLADLY told her to, guess what, I WAS RIGHT. Instead of admitting defeat she continues to argue till she wanted to start a physical fight. Like bro last week you told me you thought stars were "lights" in the sky... like lanterns... and you want to tell me about breast cancer. I was somewhat friends with my ex, since we both agreed when we dated, it was just friendship. So, I'd hang out with him and she self-invited herself to hang out. 

So, now that you have context of her. When my parents had left for another country for a WEEK. She (16) went out drinking, fucked a guy (20) in a stairwell on the first night they were gone. She called me and told me everything. By this point it was April 2025. I had enough of her attitude, lack of respect and gratitude. She never said please, never thanked anyone and always asked my parents to buy her stuff that she tossed away the next second. Even admitted to me that she saw my parents as piggy banks. She even told my ex about the whole situation and even he was stressed out, and we hung out more to talk about it.

My parents had enough and sent her back to the foster system because she was really affecting me, mentally and physically. I also found out she wrote in the diary I BOUGHT FOR HER, that she hated me and my whole existence. Like Gee, that's the thanks I get for taking care of you. Anyways. She starts dating this guy she had a crush on for 3 years; she said that she only liked him for the chase and when they got together, she lost all of her feelings. Am I surprised? No, she dated like 3 people since she lived with us so. But she then proceeds to hang out with her BSF boyfriend. MIND YOU, she's staying in the BSF house. But the BSF boyfriend and her hang out a lot and they start a thing. She is still taken btw, and the guy too. So, she's cheating. ON TOP of that, she started hanging out with my ex. 

SIDE NOTE: 

My ex had redeveloped feelings for me; I knew about it, but I never addressed it and acted like I didn't know. It's bad on my part but I didn't want to ruin the friendship. He is also an alcoholic lowkey, he always talks about wanting to go back to Cambodia with his dad to drink and yada yada alcoholism. My sister would always ask him to bring her to drink but he'd say no because she's underage. we both were 18. 

So anyways guess what he does. Brings her drinking, in a public area, where a lot of teenagers go to drink. Believe it or not, they fucked, in the open, where everybody is. This guy tells her "You better not tell Sofie" because he knew if I found out, I would never get back with him nor talk to him ever again. AND HES RIGHT FOR ONCE. HAHA if you know that then don't do it bitch ass. Anyways, she had also been fucking her BSF boyfriend. 

So naturally, SHE GETS PREGNANT. With who's baby? 

Option 1. Her Boyfriend

Option 2. My ex

Option 3. Her BSF boyfriend

Obviously, her boyfriend and BSF find out, and they left her and the BSF and her boyfriend got together... some love triangle. Also, she told me while laughing that she fucked my ex. Like bitch why you laughing... At least I know who the father of my child would be. Also like if it was my ex... he's a chopped alcoholic, that baby bouta be nerfed. Also we never found out who daddy was... she aborted the baby. But like the BSF boyfriend that she saw on the side, he became her boyfriend. AND GUESS WHAT. KARMA BITCH. He cheats on her like there's no tomorrow, and he got her BSF pregnant. So SUCK IT HA.