The Welshman crossed the ball for Son to stoop low and head home for the opener in the Europa League last-32 first leg, the first of four Spurs would score in Budapest.
Bale has struggled with minutes and impressed in flashes since arriving on loan last summer, and Son says he is happy at being able to play with him.
On linking up with Gareth Bale: “I have a really close relationship with him.
“I’m very happy he’s getting game time and scored a goal and got an assist. I really enjoy playing with him.”
Son’s goal in the Puskas Arena came a few weeks after he won the Puskas Award at the recent Fifa The Best Awards.
“Playing at this stadium – it’s massive,” he continued. “It’s very special because I won the award for the last year.
“We got the win, that was more important than the special feeling. It’s very important we showed from minute one that we wanted to win, not only 1-0 or 2-0.”