I never used to, but I'm finding myself doing this more now.
Me, too! It's interesting, all my life I have never felt anything if my breasts or nipples were played with. But, now, a few years after reduction surgery, my breasts are more sensitive & they sometimes 'ache' to be played with while masturbating. It seems to depend on how turned on I am beforehand & if I'm fantasizing.
I wish I had four hands so when masturbating, I'd have enough hands!!!
If I am playing on my own, I might start with breast play, but that is about it as I use both hands when I get down to it. If I am being watched, then I include much more breast play than I usually do on my own.