Aubameyang struck twice in yesterday's FA Cup semifinal victory over Manchester City.
And Tierney said: "It was hard. We knew we would have less ball possession against City and one has to take the chance when it comes. Aubameyang does what he does.
"Aubameyang has been doing this for so long. It's an honor for me to play with him.
"The ball I played was not a goal chance, but he made it one. We are building something big."