AITA for making my sister sleep on the pull-out couch?
I (19F) have an apartment near my college. Recently, my sister (21F) has asked to stay with me and I told her yes, but on the pull-out couch. She was only supposed to stay a week, but she's been here almost a month (she lives with our parents). She goes out late and basically does what she wants. I think she's staying here so she doesn't have to deal with the rules of living at home.
My boyfriend stays over a few nights a week and so I don't exactly have space for her in my bed, nor do I want to give her my bedroom (want privacy and such). She asked me yesterday if I would take the pull-out couch so she can have the better bed since she's older and I said no bc it's my apartment. She got really mad and said that I wasn't being a good host or a sister, and how rude it was for me to take the bigger bed and have my boyfriend over. AITA?
eta if its relevant, my grandparents pay half my rent, my parents pay my car insurance and phone + $100 a month for groceries and everything else I supplement, so I'm not completely financially independent since I'm lucky enough to have people willing to contribute