Help !

[aguy]

I need your help on this one,I hooked up with a very well hung lady recently but there's an issue.

Her dick is HUGE,I mean she's like 9'' and very thick so as you can imagine there was a classic problem.

After plenty of lube and foreplay I finally took it all the way in and really liked it but as she thrusted harder it started hurting and I just couldn't continue.

It was not the usual anal pain that goes away with patience and lube,it felt like she was hitting my inner "stuff" in a painful way but I don't know what it is exactly.

Is it pelvic floor pain/rectum issue ? Anyone with medical knowledge here?

Keep in mind I never had that issue before,I've had experiences with large cocks but never that big so could it just be a size thing?

It's a shame because we really like each other but I just can't take it when she fucks me more than 5 minutes!