This game is animated manga porn parody on popular Tv animation series"Johnny Test". If have not seen this toon or have no idea that it even exist you should actually know one thing about it - they have redhead twins in it who loves to invent some dangerous and awesome items! Yep, their names are Susan and Mary - similar to in the title of the game. And now they are going to test their fresh invention - fucking system with numerous manipulators (in other words - a robot with a pile of metal tentacles). This seems to be avery important project for both them and that is why they are testing it again and over and over. Just click the screen to view them nutting and give them couple seconds to break and they will be prepared to cu... err analyzing !