Need help with "fatty's problems"

Had a long and amazing night. Probably closest to pull ever. Opened about 30 sets. Was around 5 good ones, where I spent enough time, failed to escalate properly though so I lost each of them except of one, where I got "fatty problems", "fatty" actually was HB7, pretty nice looking girl, who was the friend of my target, of which I had no idea when I opened her.
I tried to get her sister, which was HB9. Really amazing chik, the problem is that I opened the other chik in some lame way and she thought I am some creepy sh1t, so she blown me away. The funny thing was that I got that chik totally hooked, I was actually Escalating with zero resistance. She was only smiling and hugging me but probably was not enough physical lead there. She actually was sitting in an arm chair, I was sitting low playing with her leggs. When her sister started to scream, " go away" I tried to be unreactive, but she started to shout "security". So I politely left.
If anyone can give me an idea what to do in that situation and if there is any way to fix it in the future, please give me a feedback.

Haha, I wouldn't have moved. Your target didn't mind her touching you so who is someone else to yell for security?

As for how to avoid this, when a girl has disapproved of you when you use a lame Opener, don't hit on her sister next. Women value the opinion of others, and a sister isn't "just someone" either. You didn't know here so there was nothing you could do.

Thx a lot man, will not move in the future