Witnessed an orb (round ball of light} paralleling a commercial flight. Both at different levels and at different speeds.

I live in a rural area where I have lived for over 38 yrs. A territorial view home, an unincumbered view from south to North as well as everything between. This night in question at the time presented above I was outside taking my little dog for his outside tinky-winky before to bed him. I do this to just monitor him from predators (coyotes) and such. With my view I always look to the sky because I can see all the traffic coming and going from PDX. Depending on the weather the flight paths that deferrer from how they take off and land in conjunction to the weather patterns here. I know all the flight paths from planes coming and going depending on offshore flow and of course the Columbia gorge. This particular incident night was calm with high clouds.
When I was outside I was immediately drawn to a commercial flight, flying due north bypassing Pdx with all navigation lights visible .Descending at from 25k-30,00 ft. Most likely on a decent to land at SeaTac. When I first noticed the plane, I also noticed this orb flying ahead in parallel, mile or two apart with the orb at an elevation 10k above the commercial flight. The commercial flight by passed the orb. Flying in total parallel, but at different elevations. I brought my witness to see this as we watched the commercial flight overtake and pass this orb at different speeds as the orb at 400- 450 mph and the commercial flight at 550-600 There is no way the pilots could not see what I witnessed.
Check flight logs and whatever you do, this is legit!