Disclaimer I don't own RWBY or The Flash, that honor goes to the their perspective owners. Also I went with the CW Flash because the comic book version is just ridiculous (how can their be a brain that process events in a nanosecond) and I don't know the DC Extended Universe Flash as much as this one.

Your character's name is (y/n) (l/n) (your name and last name)

I was walking to Ruby's house with her dust cartridges.

knock knock

"Hello (y/n)." greeted Ruby.

"Hey Ruby, I got your cartridges" I told her.

"Thanks, would you like to come in, it is super late for to go back to Vale." offered Ruby.

"Good point." I responded.

"Hey (y/n)." greeted Yang.

"Hey Yang." I responded. I stayed at Yang and Ruby's house, I ate diner with them, and slept at their house in the living room.

Next Day

I have to now go back to my house in Vale, and get ready for Beacon because I told Ozpin that I could help with the maiden problem that he is having as a scientist. I finished breakfast with Yang and Ruby.

"Well, I gotta go back to Vale. See you all next time." I said.

"See ya." responded Yang.

"Bye." said Ruby.

Timeskip

(this your lab)

I was doing a little bit more research and experiments for Ozpin, and it was raining heavily outside and there was heavy lightning storms was coming, I also had dangerous chemicals opened because I needed for the experiment, and I had the windows opened because I always liked the windows opened and hear the sound of the city when I do the science plus some of the chemicals smell bad literally. 

"Okay, there we go I closed all of the windows but am I missing somethin... of fuck I forgot." I thought to myself as I realized that I had the top window opened with a chain, I also needed for the experiment, I was closing the window and I noticed that the chemicals were rising somehow, not only that when I looked up into the sky, lightning striked the chains and I was shocked and sent all the way to the chemicals and I passed out and felt a little bit of electricity around me.

The End