TPE torso sex doll (male masturbator): insert silicone…

So, I have a cheap TPE torso doll that I purchased from Amazon. It feels so good and I want to keep it and make it last. I dry the orifice by inserting a (silicone) tube into the orifice using an aquarium pump. See the picture of the aquarium pump setup: it does a great job of thoroughly drying the orifice. Here’s the thing now. I noticed that the part of the pipe that went into the doll hole became very hard (pun not intended). On the other hand, the parts of the tube that are not in contact with the inside of the doll are still very soft and pliable. This makes me wonder if the silicone tube becomes stiff because it comes in contact with the TPE material. If so, does that mean the damage could happen in the other direction? i.e. is the orifice of the doll damaged from contact with the silicone tubing? **The basis for this concern is that we should not use silicone-based lubricants on TPE dolls. Yet, I inserted a silicone tube into a TPE doll**? Thoughts and suggestions? Thanks! !

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