UncleNinja - My Lovely Sis! Demo2

In MyLovelySis! you are a nerdy guy with an unbearable sister and on a beautiful day your parents are going to travel and leave you and your dear sister with an aunt until your parents come back from traveling.
But not everything is as you expect. Suddenly, a succubus comes out of nowhere to further embarrass your life. (Yes, succubus exist!)