My nerd young sister

I'm 3 years older than my sister and when I went to the university our parents bought a small flat were I live until I finish my studies but this year my sister came to the university too and our parents said she had to live with me. I got really hungry but I couldn't do anything against it. I thought it would be a pain in the ass to have her around but what I knew about her was the opposite I of want she show me while we were far apart from our parents...