Most Helpful Guy
Well i think she is very selfish... i guess she doesn't want to disturb her sex life because of you coming in her house... But that is very selfish behavior...
Most Helpful Girl
It's just for 2 weeks, why doesn't she want you to stay? Plus, you're her sister, that's sad :/
Try to convince her and if that doesn't work, then find another place to stay in, like a hotel or rent a studio/ apartment for 2 weeks.