I had forgotten about this one and I just tried it, the scene is not avoidable, it is the first scene that the Mc sees when he gets home, he goes up to greet the step sis and she is fucking with a friend of hers (obviously the Mc thinks F/F it's HaWt) plus the sister is the typical bitch that mistreats Mc, the next day thanks to that scene she blackmails him and steals all the money he has haha