My new sister, who was born after my parents' remarriage, treats me like a child, partly because I tend to look younger than her, and uses me as her chin. - I thought that she was a gal and was very flashy, but I didn't like her. - When my sister, who is obsessed with tanning, returns from the salon, she always orders me to apply aftercare oil. - I reluctantly listened to what he said, but I started getting horny when I saw her oiled up, wet and shiny body... - My sister, who thinks I'm an insignificant child, doesn't seem suspicious even when I touch her sensitive parts. - So I set up an erotic massage to get revenge on my sister who always uses me with her chin.