Who think this girl really want to have sex with me?

Am asking this strange question cause I don't know no more. Before you decide let me fill you in on what going on. The story that will be told in this is a little long btw.

Ok my sister friend ( who live with us am not saying no age but she is not younger then me) we can call her t. Now when I first met t she used to act like she was flirting with me ect. Am not no fool so I just ignored her. She say she don't want to go to the bedroom with me ( if you know what I mean). But I think in a secret way she do. My reason for this? Here today story ( it been a months since I met her and the flirting got more serious it seem like since then). I came home I walked in the kitchen and she was in there and she started trying to dance on me. I ignored it I went into the front room. She came in there with my sister. My sister kept walking in and out. And t got on me cause I was half way laying down on the couch. And she start talking about all this. Like yea where you going to give it to me ect. Ect. I told her get off me. ( of course I flirted back). When I turn my head for a second. She put couple of hickey on my neck. Ect. Ect. We kept going back and forth for a little while. Then she left to go outside she came back in like 15 min later. And started "fake flirting" as she call it. Again ( here where things got wild). So I got tired of just trying ignore all this ( no lie she sexy). (also my sister is in the room now). She got on me again. But this time I said something like " d*** them big jugs you got" ( cause her jugs was hanging in my face). ( by jugs I mean boobs fyi). So she got off me and acted like she was going to pull her shirt down. So I put my hands on her and was like " you going pull it down some more". And she did ( which shock the hell out of me). So now am like dang and I grab one of the bra cup and like start acting like I was gonna pull the bra down to. And she was like you want me to pull it down to. And I was yea sure why not ( and she did which shock the sh** out of me). And she showed me her nipple ( not fully just a real quick peek). ( now here go where thing just go super wild). She pulled her bra back up and was like am gonna take a picture with yo phone. ( she was talking about talking a pic of her jugs). So I was like ill take it. So she was holding her jugs ( the bra was up). And I took it. ( am sitting here flipping out in my mind). So I was like you gonna let me take one with it down. She said yeah. But she covered her nipples with her hands ( but still that crazy). And my sister was sitting a few feets away.

Now with all that said. ( pretty amazing story). Am starting to think secretly she want to have sex with me. I never met a girl who would let me take a picture of her like that. And she let me so easy. Am lost now I don't know what to think... But I know one thing my day became a lot better now! :d

But yea what do ya think about this? ( cause it getting a little hard to ignore her )