U.A.P flew up to slowed down and passed an airplane with both exhaust like the plane

I was watching the sunset after my son had got me out of the house finally from telling me two different times that he kept seeing something in the sky. When I seen a single engine airplane creating exhaust clouds. I then noticed another object following it as it proceeded to gain on the airplane following in the plane am exhaust clouds.The UAP then passed the plane and put much distance between them.
The object never once let out any similar exhaust from a motor like engine a typical airplane would have.
The object most DEFINITELY came in contact with that air pilot. I wouldn’t doubt if he made a report himself as the UAP was extremely close to the plane as it passed it..It followed the exact path of the airplane from the beginning of the planes clouds to passing it. As the UAP went into airplanes clouds it wasn’t able to be seen.