Here is the yandere blueberry route

Reader POV

I placed my hands on blueberry and he woke up and his eyes turned a shade of blood red. He said "Y/N I meant to tell you a long time ago but i". He kissed me and got up. He then had a knife in his hand and hit error. "I love you y/n and I won't let anyone take you away from me". I was surprised by what he said . Error was at one health and Blue hovered over error and was about to kill him since error kissed me. "Blueberry don't do this I liked you and I always did like you I ways just scared to confess."

Blueberry POV

When she said that I froze and dropped the knife. "Y/n I just don't want to lose you". I turned and hugged her tears in my eyes. I suddenly felt something go into my heart. I looked at y/n and she had tears in her eyes she was on her knees looking at me. I realized that I got hit from my back to my front and Error had a flame in his eye. I hit error and he fell to the ground unconscious. The bone went through my body and y/n took it out trying her best not to harm me with it. She healed me and kissed me. She was usually shy and filled with DETERMINATION. But this time she was okay with this. It made me blush a deep shade of blue.

I will continue