Across Dimensions

You are a young scientist (who specializes in alchemy) and your also an inventor. You have an older sister who isn't that bright and you two are in the same grade (you skipped a few grades) even though you're about 5 years younger.

After two years of working out kinks and just creating it in general, you finally made a key to travel the dimensions. What you find out though is that it's a one time use. You go to the TTS universe and it's at the beginning of the series and that's where your real story begins.

I may rewrite some chapters and details