My sister is a fake lesbian (Part 1)

My name is Vinício I'm 24 years old I'm 1.82 I'm skinny white and blonde with brown eyes and I have a 22 year old sister named Bianca a blonde 1.67 green eyes skinny but with breasts and big ass. My sister a few months ago started dating a college friend named Ronaldo, and this relationship started like every toxic relationship at first it was a perfect relationship the two of them were always together one didn't leave the other but with time. Ronaldo started getting extremely jealous and paranoid one minute he thought Bianca was going to break up with him another minute he thought she was cheating on him until he decided to break up and start a relationship with Bianca's best friend. Her name is Carmen and I don't even need to explain how devastated Bianca was that he was cheating on my sister with her best friend, it's that old saying excess jealousy is because you already know it was horn or because you jumped the fence and you're afraid to take the fall. After that situation, we bonded like brothers. We went to the gym together. We hung out together. Bianca started sleeping late and waking up late was getting freckles And I started hearing noises and moans coming from her room, and it was extremely embarrassing to know that my little sister was ending up in the syringe. I just pretended like nothing was happening and tried to live a normal life but I couldn't help but look at her the same way but I never tried to cross the line. But Bianca's life changed completely when Carmen knocked on our door late at night she asked for shelter and the three of us talked until late at night because my sister was lucky what she told us was to turn her stomach. Carmen had moved away to study so she had no immediate family and since Ronaldo knew where she lived she asked to spend a few days with us. We let her live in our house and after a few days Ronaldo showed up wanting to talk to Carmen and my dad and I wouldn't let her talk to her so he tried to break in. The three of us argued and since I was outnumbered I made sure to provoke him and humiliate him I knew he was hot and cowardly so he would bark but not bite. I could see that he wanted to hit me but since he saw that he could not get anything there he had to swallow his pride to get out of there but before he left he threatened me. After that incident, Bianca and Carmen eventually settled down and became best friends again, and now I pick them up from school every day. What made us very close especially Bianca and Carmen who fell in love and started dating Bianca looked like someone else had no more eyes was with a very happy and radiant countenance. The only thing that didn't change was that whenever Carmen left or Bianca locked herself in her room or took a shower, it was obvious that the two of them hadn't had sex yet and Bianca was getting more and more frustrated. But things got a lot weirder because I got an apartment very close to work it's very small but it's so close to work that I don't need but take the train. And what's weird about that is what you probably want to know. Well, that apartment wasn't just close to work, it was close to school, too, because you think I'd go and look for both of them. At the time of the purchase I didn't even care but when Bianca found out she asked me to live there right away, I refused without thinking twice there was no room even for me. I only lived there during the week because I didn't have room to put all my stuff, so I didn't have a choice. Anyone who's ever had a brother knows what I'm talking about. She triggered our parents and magic happened now a small apartment got extremely small you think this is not strange enough calm it will get worse When Bianca moved in with us, we had a lot of problems, but we also developed a great intimacy since the apartment only had one room each, which includes a single bedroom. So we agreed to change how much, but no one could sleep on the fucking couch, so we had to sleep in the same bed. But in the middle of the night she'd get up to go play Siren in the bathroom and I'd end up listening to her moan in the bedroom since the walls are thin even though I didn't want it to make me extremely hard but I always hid the erection. Until the big day came and Bianca told me that she was going to have a romantic night with Carmen and that they were going to have their first time. So I thought this nightmare would finally be over but I was wrong when Bianca came home she was crying I hugged her and asked what happened. (Continue on part 2 if you have part 2 I literally finished writing at 4:00 in the morning but a little and the sun comes out)