Daughter at the Hotel

I am a divorced mother of an 18 year old girl. A few months back, we went to visit my sister out of state, and since it was a long drive, we had to stop at a hotel for the night. Since it was hot in the room, we both just had on our night shirts and didn't bother with the covers. Around 1:00 am, something startled me and woke me up. I glanced over at my daughter and not only saw her shirt hiked up and underwear off, but her eyes were closed and she was quietly masturbating. Not only did I not know she did this, but the fact that she was doing it with me in the same room surprised me. I guess since she thought I was sound asleep, I wouldn't find out. I lay there for about a minute watching her, and I started feeling the same itch that she apparently had. Silently so I wouldn't startle her, I inched my underwear down to my knees and began rubbing myself as well. Not long after, I decided to have a little fun with her. I rolled over on my side so I was in clear view, trying to see if she would notice, but she must have been well into it because she didn't move at all. I then cleared my throat, which caused her to slowly open her eyes, and after a few seconds, looked over and saw me with my knees apart, fingering my hairy pussy. She gasped, sat straight up and grabbed a pillow to cover herself. "Mom! What are you doing?" I giggled and said "oh come on, everybody masturbates, even your mother. You think I don't get urges like you?" "I guess, but aren't you embarrassed that I can see you?" "Oh come on, don't be a prude, we're both girls, we both have the same parts. Now put that pillow down and come lay next to mom so we can talk." As I said this, I kicked off my underwear, pulled off my shirt and spread out, continuing to gently rub myself. "Well...ok." She put down the pillow, pulled her shirt off as well and plopped onto the bed next to me. For about an hour, we sat there in bed talking about everything; school, boys, movies, and of course, masturbation. How often we do it, where and how, when we started, and I even told her about how I used to do it with friends. Apparently, our conversation got to me a little quicker than her, because soon after I bucked and cried out in an orgasm. As I was coming down, I heard my daughter say to me "alright, you go mom!" I couldn't help but smile as I turned onto my side and watched as we continued to talk and she kept on masturbating. About five minutes later, she got quiet so I knew she was getting close. She then said to me "oh mom...I'm gonna cum." I started scratching my toenails on the sole of her little bare foot and told her "go on, make it happen. Cum baby." She then stiffened, let out a little moan and then a big sigh as she came. We lied there for about a minute looking at each other and smiling. She then stood me up, gave me a big hug and said "I love you so much, mommy." She hadn't called me mommy in years. "I love you too, honey." We then both got back into the same bed and she snuggled back against me. I put my arm around her and we both fell asleep without a stitch of clothing. We haven't masturbated together since, but now we are both very open about it and walk around the house naked all the time. I think my daughter and I are much closer now because of it.