Hmm.. well, did あなた try the Polyjuice potion yet? If あなた did, then あなた might be able to get into the common room によって going through the chapter, like あなた always do.. (I haven't been on ポッターモア in forever so sorry if I get stuff wrong) If あなた can't do that, then maybe , try and add somebody that's a Slytherin and see if あなた can get in then. =/