The time my Girlfriends button flew off her pants and hit the wall

This was years ago back when I was 18 as was my then girlfriend and is one of many stories I have that involve her immense size so if you'd like to hear more please let me know.
So anyway I had gotten with this girl at the end of our senior year, we were both 18 and she was fat, very fat, even when I met her. She had a big round spherical belly with a crease across where her bellybutton was, pretty big boobs DD cups but they still stuck out only slightly past her big tummy, her ass was wide and gargantuan. She weighed just over 210lbs at first and only ballooned the longer I knew her, and being only 5'2 she looked absolutely huge, like you could roll her down a hill. And this girl could obviously eat, she ate and ate so much she was constantly outgrowing her clothes to the point that she couldn't keep up with her own tummy, which is precisely what happens here.
One day she was sitting next to me on the couch going to town on a huge pizza/meatball sub, and when she takes a really big bite I hear a weird sound and look down to see the button on her pants pulled up to her tummy is literally holding on by a thread, and just as I'm about to say something *snap* it bursts off and flies across the room hitting the wall with her huge gut spilling into her lap. I immediately start to kiss her tummy and play with the blubber it was just so hot.
She was upset for a second but pretty much immediately went back to her sub as I kissed and rubbed her big tummy. It was absolutely fantastic.