My new older sister, who came about from my parents' remarriage, treats me like a child, perhaps because of my appearance, which tends to make me look younger, and uses me for various things. i disliked her, who was so much like a gal and flashy. my sister, who is obsessed with tanning, always tells me to apply aftercare oil when she comes home from the salon. i was reluctantly doing as she said, but when i applied the oil and my body became wet and shiny, i started to feel horny... my sister, who thinks of me as a worthless child, doesn't seem to suspect anything even when i touch her sensitive parts. so, i decided to launch an erotic massage, also as revenge on my sister who always uses me.