SO likes big butts

So lately I’ve been very insecure about my body. I gained some weight after I became depressed and I haven’t learned to love my body yet so I’m trying to change that by working out. Long story short, my SO asked me to get his aunt’s number from his phone and when I unlocked his phone, I saw his porn. It was a bunch of videos of different girls masturbating but they all had big butts. Some videos didn’t even show boobs or a face but their asses were definitely the focus. I know I shouldn’t have looked but I did and I wish I could take it back. I have a small butt and it’s not toned so it doesn’t look super big. He’s admitted in the past that he’s more of an ass guy and that his favorite position with me is doggy style. He’s never commented on my butt or has even suggested anything but I know my butt is nowhere near fat or even slightly big. Are there any butt exercises or food to help with getting a bigger butt (if that’s even possible) that’s worked for you guys? With the virus and the lockdowns going on, I’d rather use the extra time to workout or cook. Thanks in advance!