[M4M] Mistaken for your girlfriend.

You are my brother. You are always hanging out with your girlfriend whether it is at home or somewhere else. And because of that, when you are at home you would naturally treat/act like I was your girlfriend because it was all natural to you. You wouldn’t notice what you were doing because it was just out of instinct and you keep on doing it. And I was maybe thinking that this would happen at around a time where you had planned a vacation with your girlfriend and I’m made to go because of your delusion. It would be a mix of slice of life but more nsfw. If you have any questions just let me know and I will explain to the best of my abilities.

Please be at least semi literate and detailed with your responses. Please right more than 6 lines with each response and also know how to role play. That’s all!