I was banging away a size 16 in doggie a while back. Nothing was happening except I kept falling out.
Finally I gave her a little shove and she hit the deck with me on top in a sort of prone bone position. Eureka !!! I was fully penetrated and kept going to completion
n.b. the push wasn’t intended but it had the desired effect.
Only a size 16? You wanna get on a real BBW, not just a curvy girl, ie a 20plus. Get them warmed up well with a good bit of foreplay and well, some could wear you out. Some of the nest sex ive ever had was with (at different times of course) two FWBs i had when i was younger. One when we were early 20s was a redhead who was around a size 20, we were both happy as friends, and would spend a lot of time together with a group of mates all chilling out having a smoke, playing video games round hers etc. A good couple of times a week, id stay after the others went home and we'd have some amazing sex. Something clicked between us, both into a bit of experimentation and not many inhibitions.
The other a couple of years later was a half asian (middle eastern) girl who again was perhaps a 20 possibly a 22. Im not all that with dress sizes lol.
Big wobbly bums when in doggystyle, both had average sized boobs so not huge but big hard nipples with big areola, big fat tasty pussies to dive into face first, both liked a 69, gave simply amazing blowjobs, and liked me giving them a bit of rimming too so could bury my face right in there, and the redhead loved anal.
As i said, was some of the best sex ive ever had.