(Yandere!Platonic!Rudo Surebrec x Isekaied!Reader)
A/N: Okay, I had this idea: what if Reader is actually a Sphereite and was with Regto when Rudo was little and looked after him, but suddenly disappeared into the other world and lost her memories until she appeared there on the Ground. (Reader is described as a female)
Summary: There will be two parts to this, one after Reader raised Rudo with Regto, and the other after you reappeared in the ground. For Rudo, it's as if a miracle has happened. Except that the yandere tendencies have become much stronger after he realizes that you have completely lost your memories of him and Regto.
When you lived on the Sphere you were already with Regto when he took Rudo in. You were always a mother figure to Rudo and were so important to him. He always felt strange, as if you were his real mother, but also something deep inside him that never wanted to let you go. "Rudo, I just have to get something." But Rudo never let go of your hand when you were nearby. Only when Regto had taken care of Rudo could you continue what you wanted to do. Rudo was a clingy child when it came to you; even at a young age, he refused to go to sleep unless you were with him. Despite the fact that he was always so emotionless and withdrawn, you could see a slight glimmer of hope in his eyes. Rudo loved to cuddle with you in the morning, to hear your gentle voice, and to feel your warmth. You were also the one who gave Regto the Watchman series gloves before he later gave them to Rudo. One day, Rudo returned with Regto, but you were suddenly gone. Rudo didn't understand, and Regto was panicking. Where were you? Even when you didn't come back for the next weeks and months, Rudo's condition worsened. He became more withdrawn, unable to contain his anger any longer, and began fighting with the children from the slums who were bullying him. Until Regto gave him these Ha roof shoes. And you? You woke up in a bed in this world. You couldn't say what your life had been like before, and so your life began in this dreary and boring world.
When Enjin brought you to the Cleaners' headquarters, Rudo couldn't believe his eyes. He had told Enjin about Regto, but never about her; the memory hurt too much. And when he realized that you had completely forgotten what had happened before, something snapped inside him. From that day on, Rudo was so clingy, and you didn't know why. Even though the Cleaners were important to him, you were more important to him, and you could clearly see that Rudo didn't want anyone else close to you. And especially when you were so motherly to Dear, he couldn't help but be jealous; that motherliness belonged to him and no one else. He often clung to you by the hip. One evening, when Enjin returned to the common room from a solo mission, he was surprised to see you asleep on the couch under a blanket with Rudo in your arms. His heart warmed, and he couldn't help but think about what you would look like with a child from one of the Cleaners. But before he could think the thought any further, he heard Rudo's voice and that dark, possessive look. "No, she won't have a child, I am her child." Enjin was surprised, but left it at that and talked about it with Corvus and Semiu the next day. And when they brought Rudo back, he told them everything. It was crazy, but the fact that you had already appeared from another world made it believable. They had an agreement with Rudo that he could continue to seek your company but not hurt others. And so time went on, and you couldn't help but feel that Rudo held a special part of your heart, like your own child.
