Nothing, it is natural.
It can be extremely hard to fingerbang with a dry finger. If she is not 'turned on' or 'wet' then you should wet your finger with water beforehand. Make sure your hands are cleaned to avoid bacterial...
Have you ever seen a four story building explode. yea something like that.....
All the Serum (water) will flow out. You need to disinfect it, cover it and protect it. I would advise you NOT to pop a blister.
Its a health condition. He always does. It's like askin, Why cant blind people see? It's a health condition
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