new friend... or not

[Lindsey]

Well you guys know about the new friend I found. Yesterday we went for lunch together, went shopping, and then had a little martini party here at my house. During our conversations, I found out that she's very... well I guess almost addicted to sex. My brother and his friend were here for a little while and she kept telling me "Oh your brother is flirting with me! He's cute!" but he's my brother, and that's kind of off limits, right?
Well she had his number because I left my cell phone at home so I had to use hers to call him. He called back and asked for me and she said "What do you want to talk to her for? You can just talk to me" So she got him to come to the bar we were at, and pick us up so we could go to another bar with them. They were holding hands in the car. They left me alone in the next bar to go dancing all night. She came home with us and I felt so awkward. She was on the couch and my brother just went and sat on the floor beside her until I went to bed. They made me bring my dog into my room and close the door so they wouldn't be bothered, so I did. Then I realized I forgot to bring in a pee pad so I went back out to do that and all I heard when i got out was them squirming and my friend saying "see, i told you!" When I got up this morning, I guess they had both moved downstairs so I wouldn't hear them. She's still here, and acting like nothing's wrong. I'm so angry.