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The brother who obtained a tool to fulfill his fantasies accidentally switched with his sister during a trial! His curiosity about the first female body makes him unable to stop body checks. The smell, the weakness of strength, the speed from urinary urge to real urine, especially... the sensitivity of the contents of the vagina is dozens of times that of a man!? Masturbating endlessly with a pussy that gets wetter the more you touch it → first orgasm with a different sex. What he's interested in is the man's cock. "What will happen if I insert it..." And finally incest insertion. The story of a sister (male body) and brother (female body) who secretly have creampie sex with their parents.
