After a few years studying at a university in Tokyo, my younger sister took advantage of the New Year holiday to visit our family in the countryside. I was truly surprised that after a long time apart, the once chubby little girl had turned into a beautiful, graceful young woman, but... I couldn't believe my eyes, my sister now no longer had the innocence she used to, and instead there was something very feminine, very seductive; this was evident in her way of dressing (skirt too short, clearly showing her underwear, wearing a very thin top, clearly displaying her large and firm breasts). This made me very uncomfortable, and thoughts of incest always came to mind whenever I saw her. What should I do???