Tree Hugger (Pietro x reader MCU)

The beginning

It's been 2 1/2 years since Loki attacked earth. I am (Y/N) Banner, cousin to the big guy sort of... anyway my backstory.
About three years ago I was working on a project with my brother Aaron. We were so close to a breakthrough that my brother ignored my warnings to get out and save himself. He was so wrapped up at his work he pushed me away, disregarded the danger he was putting himself in. I ran into see him but I was too late. That much radiation should have killed me, The worst part was that it didn't. It killed him, but not me, I have to live with that over my shoulder for the rest of my life. I blame myself, for not acting faster, I could have saved Aaron but I was too SLOW(😉).
After the exposure I got my powers at the cost of my brothers life. Bruce sort of replaced the overprotective big brother feeling.
That's two Banners to survive a radiation exposure, Bruce being able to turn big and green, and me being able to make someone feel weird intense pleasure and Bliss, enough to immobilize them (which is in my mind better on the battle field). But Bruce doesn't want me getting hurt, we are the only family we have left. Finally after some time and a lot of convincing he's decided to let me join the avengers on one condition...
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A/N: thank you so much to the people that read this, Pietro is one of my favourite characters and I feel like he doesn't get enough love. I hope you enjoy this story, I am also working on a Loki x reader called The Fallen Asguardian. Feel free to check it out, comment any corrections constructive only please, feedback is always helpful. Also comment ideas or suggestions, as with the other story I have pre-written this one but would like to hear your ideas as well, the story is not just for me but for the Readers so I want to make it what you want. Thank you and hope you stick with it. Love you all 3000