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Max goes to see his doctor to get his balls checked for lumps but is horrified to find his doctor is away and his stepsister is covering for him! She convinces him she has seen it all before and commands him to strip off. As she starts examining his nuts he gets an erection but she just smiles and says it happens to her a lot. Dr Wood is confident there is nothing wrong with Max but insists on jerking him off until he ejaculates so she can be sure. When he cums she catches the semen in her hand so she can show it to her young receptionist!