Hooking Up with a 23-year-old

This happened less than a week ago. My best friend started dating a girl he met at a bar and, lucky for me, she had a 23-year-old sister. After going back to with them to their place, she invited me to "watch a movie." We only ended up making out and feeling each other up. But next night same thing happened. This time as I was pulling her panties to the side and she told me she was on her period. I changed up my game plan and just kept rubbing her clit as it grew.  I did it first with one finger circling her clit, then two, before she quickly pulled her panties off completely. I kept rubbing her clit as I freed her small hard nips from her tank top. She told me to bite her neck and her legs started to shake. She grabbed my hand I slowed for a second or two. Then she let go my hand so I started up again. This time I did it faster and added in a little more side to side action; all the while she was moaning away telling me she wished I could fuck her while squeezing my cock, which was getting hard in my boxers. Since I couldn’t finger her, I couldn’t use her own wetness to my advantage: I would have liked to have her suck my fingers. Before starting to play with her clit again, I started to bite her neck. She begged me to bite harder so I did. She started to shake again and then squeezed her legs shut before pulling my hand away. Then she pulled out my cock and started to suck it. I was completely hard in less than a minute. I got to see how deep she could go and, to my surprise, she pretty much took all 8 inches – maybe there was an inch left. I started to fuck her face. She was on her knees and I was still laying down; she even moved her arm to give me better angle to see what she was doing. I fucked her face for 5 mins or so until she choked a few too many times. Then she started to just stroke me and suck my head for another 5 minutes, until she said her jaw was tired. We started making out while she was stroking me. I could tell she wasn’t going to get the job done so I asked her to play with her pussy while I started to jerk off.  We did this for few minutes and then I came on her tits. After enjoying the show and resting for a few minutes, I took over rubbing her clit. I did it as fast and hard as I could while telling her I wanted her to cum for me. I was pinching and biting her neck and nips (she seems to like it rough). After only about 5 minutes she came again. I held my hand on her pulsating pussy before giving it a few light smacks that seem to send shivers down her body. Then we both passed out. After waking up next to her naked I couldn’t help but start making out with her again. My hand found her clit again and rubbed her to another orgasm – I think 2 in a row. Then she started to play with my cock again, sucking it for another 5 or 10 minutes. It felt great but she couldn’t get me off for some reason. She laid back down beside me, still stroking my cock as I reached over with my right hand to rub her clit again. After a few minutes, she was moaning more and stroking me less. She finally came again, one last time. Needless-to-say, my hand hurt after all of that but we did it again the next night, except with a few less orgasms. After all the bites she kept asking for, her neck was fucked up the next day and looked like she had been choked (I might have over did it, but she did keep saying, “Harder.”) We are going camping this weekend with few friends. I want to fuck her everywhere, not just in the tent. Hopefully I can talk her into doing it outdoors. It may be possible since it seems she likes to give up control.