I had a great summer several years ago with a lady friend on her way to her maximum weight around 270 pounds (only unfortunately). We did it in a standing position and after climax I dropped her on the bed and she promptly broke on the slats holding the mattress. Few weeks later we broke a spring on another bed while she was on top.
And with a somewhat slimmer lady we did some damage on an IKEA bed.
I am still looking for a SSBBW that we will seriously damage a bed - to the point of needing serious repair.
7 years