Thankfully this gilr hasnt' had that happen to her. But she can tell You that yes playing with a clit can cause it to become very sensitive. Before my Master has taken control this gilr used to get work her clit quite a bit and if it is done too much it can hurt. Usually the rubbing with the fingers ( well YOu know what I mean ) can make it hurt. I"ve never had a tongue do it to me ( and I was eaten for an hour once ) so maybe it is her body that is putting limits on You two. Everyones body is different and can take different amounts of things.

I've never had a pump used on me yet so I can't help with that.

Good luck finding the answeres that You need.