Playing Twister with your sister and not having sex is unrealistic

Danni was a cunning girl and thought out a great plan on how to induce her brother to have sex, so that he would not even guess about anything. Having bought a game with circles on the floor - Twister - she invited him to try playing. The dude agreed, not yet completely understanding what exactly awaited him. As it turned out, an iron boner was waiting for him in his pants, because the beauty was constantly pressing her body against him. Either he will cling to his tits, or he will accidentally touch his penis. After such a game, how can you not fuck your sister?