I was at the club last night, in the outdoor smoking area with my friend.

Two beautiful black girls come in, one was a 7 and the other a 9. The 7 was wearing polkadots and as soon as they were in range I immediately said "Hey I like your polkadots, I remember when everyone was wearing them 4 years ago"
She laughed and I made a bit of small talk with her as HB9 came and stood next to me, the exact response that I wanted, so I focused my attention on her and left my friend to talk to polkadots.

Me: Hi you're gorgeous, what is your name?
HB9: *fits of giggles* I'm [name] and you are?
Me: Steve
-her body language was showing huge signs of attractions so I cut to the chase-
Me: What's your favourite flavour of ice cream?
HB9: Vanilla, what's yours?
Me: Mine's chocolate, and I'm not talking about ice-cream

She then shyly flushed but loved it. At this point I whipped my phone out and handed it to her and told her to put her number in. She said she didn't want me annoying her so after promising to only call her 10-15 times a day she puts her number in.
I told her I was going to invite her out for a drink some time and she very happily accepted the idea.

Everything was running perfectly, this was one of my smoothest pick ups so far. Obviously at this point I didn't know she had a boyfriend.

And then her boyfriend storms into the room and comes up to her as she quickly turns her back to me and he starts yelling at her because she was smoking a cigarette. "What the fuck are you doing" bla bla and then they both disappeared.

Now, I have always wanted to bang a black chick and this one is definitely ideal. Obviously I need to tread a little carefully and be open about when I message her.

I am seeking advice on how I should best handle this, I will probably message her at the end of today or tomorrow but I need to say something that isn't too sus in case her boyfriend reads it but still something she will respond to.
He definitely struck me as the kind of guy who would check her phone etc. It took about 1 second to see that he's very insecure, controlling and possibly abusive.