When me and exdp were in our early twenties living in London we were fortunate enough to have our own 2 bed flat. We covered a large part of the mortgage by renting the spare room.
An old friend from our home town asked to stay for a couple of weeks as she was looking to move down and find a job so we said that was fine. I got her a job at the pub I worked in straight away but we already had a couple sharing with us so she knew she needed to find somewhere else to live. Except she didn't.
She was oddly over familiar, would get into our bed when we were watching a film late at night and fall solidly asleep. DP ended up on the sofa on many occasions. She never bought food and at mealtimes would say 'so what are we having?' and for some reason we found it difficult to say no to her. She'd tag along on nights out and on her days off hang around the pub until I finished work then tag along with me and my friends.
We paid for everything for the first month she was with us, from bus fares to tampons so on payday I expected some contribution or offer to pay us back. Instead she paid her mum back to £100 odd she'd borrowed for her (first class, single) ticket down here, then went off to camden for the day and spent every penny of her wages on clothes, cocktails and god knows what.
When asked about paying us some board she pointed out that she didnt have her own room at ours so assumed she was paying nothing, and how lucky we were that we paid so relatively little anyway. When we asked about her finding somewhere else she told us our current housemates were leaving that weekend so she'd move in there , how exciting etc. Turns out they had a live in job offer in devon and were indeed moving, and happy to pay us the months notice. But they'd told her first. You can imagine what happened next....
Anyway after two months I was about to grow some balls and tell her we needed her to move on, came back from work to find her gone, along with several of mine and dps things and a note telling me that she couldn't bear to live with people who were 'stifling her bohemian consciousness'. She also stole an amount of spirits and cash from work which I felt awful about given I had recommended her. All round gob smackingly entitled , though I wish I could shake younger me and explain some things about boundaries.....