surprising "back rub"

My lower left back has been killing me for days I have no idea what I did to cause it. Old age probably. Ive been icing it and heating it. Hasn't really helped. I decided to try out this local massage place. So I walk in, there's a middle aged asian woman with glasses behind the counter "you want back rub 60 dollars an hour". Broken English big time. So I said how does this work do I leave my shirt and underpants on? "underpants only or full nude for 80 dollars an hour". full nude? that sounds interesting. I said pretty girl? She said "you want pretty girl or good back rub?" I had to think about that for a second. My back was hurting but I was also hornier than usual. A nude back rub with a pretty young asian girl sounded pretty good right about then. Pretty girl I said. "Ok one minute" and she goes in the back for a minute, then comes out "follow me". She takes me in the back and there are a bunch of rooms with curtains as doors and oriental music softly playing. She takes me into the fourth curtain on the left and says "undress put clothes in basket Mary be right in." Mary. Probably not her actual name. Well ok not what I expected but I went with it. There's a bed/table with a big hole by the top, I presume where you put your face. So I did as she said, got on the bed face down stark naked. I have to admit I was getting a little excited at the prospect of this. I was also well aware that I would probably get a raging hard on in not too much time. A minute or so passed and I hear the curtain open and soft footsteps entering. I look up at the most beautiful asian girl I think I have ever seen, 19 maybe 20 years old. long hair, big eyes, a black t shirt and skirt and a very cute smile. "Hi you want 1 hour massage?" I would love a five hour massage from Mary but I figured one hour was a good place to start. "I Mary what your name" she said in almost a whisper. There were other massages going on and I don't think there was too much insulation in the walls if any. I'm Jason hi Mary. "Jason, turn on your back to start" and she propped a pillow under my head and sure enough My cock flopped around already in a semi erect state. It would only get worse as she started to softly rub my chest and made her way down to my stomach, coming in contact with the tip of my cock numerous times. "Wow you have really big ..." She was almost afraid to say it but then managed "cock." She cleared her throat. She turned to the wall and I hear a squirting sound, she was dispensing oil. She started to rub it starting on my neck, then my chest and stomach. I didn't think she was going to intentionally touch me but then out of nowhere she rubbed oil completely up and down my shaft repeatedly. I was dumbstruck! This is what happens in these places? She kept going then mounted the table and sat right on top of me. She pulled her t shirt up over her little breasts. Wow dark and pointy nipples. And then I realized she had no panties on either! With all that oil on it, my cock easily slid right inside her and 30 seconds into this back rub we were fucking! She looked at me with the universal "silent" gesture and slowly gyrated around softly moaning. Oh my god she felt amazing and so hot around my cock. I can usually hold an ejaculation for a good 10 minutes but this was so sudden and unexpected I felt an orgasm coming on and soon. Mary whispered "it ok you can cum inside." This turn of events was getting more and more surprising so I just started pumping and within I would say 40 seconds I was shooting hot cum way up inside her pussy. She was moaning louder and I could tell she was cumming too. to be continued!