Why make a story about teacher-student when they don't act like teacher and student?
Author has something messed up with their head. The only way this story could have worked with the current progression is if they were previously acquainted, both knew eachother since they were younger, etc.
Or better yet, author could've thrown entire time-leap out of the window, since MC does nothing with it. Remove the age gap, and have a nice story instead of this.