Lurker here. I did recently experience something that went beyond my limits like this. I don't feel comfortable sharing the person's info without permission, but I'll say that she is a masseuse who also specializes in fetishes. I booked a three hour session, no safeword. She tied me face down on her massage table. Blindfolded, ropes were real tight, could barely squirm. She attacked my ribs relentlessly with no breaks for 90 minutes. I was screaming for mercy so much that she agreed to end the session early halfway through. I was shaking. She was nice enough to see me for a second 90 minute session to make up for the time we missed. If she had kept going, I'm really not sure what would have happened. I've had dozens of tickle sessions, never experienced anything like it. I highly recommend always having a safeword. You never know when you're going to have a session that just hits you way harder than you ever imagined. It was always a fantasy of mine to be pushed past my limits. I still fantasize about that session, but if she decided that she wouldn't let me go, I might have passed out. I was screwed up pretty badly after that experience. Haven't seen her since that second session, when she went a bit easier on me, but I'm tempted often.