sup guys!

My roommates friend(obstacle) and the obstacle sister came over to party with us on Friday and Saturday. We live downtown they don't, so we are closer to the action and are fun guys to be around. Anyway, I get the obstacles sister attracted to me, but i can't isolate her. The obstacle would always be like 10 ft away and it was so annoying. I'm friends with the obstacle as I have met her before and we are doing a group project for school together. So, any tips for over-protective siblings?

Regardless of what you do, I think you need to build even more rapport with the obstacle first and show her that you are a protector that she can trust to watch over her sister.
Mystery has this bit, where he just goes with the target up to the obstacle and says "We like each other. Is that cool with you?". It seems kind of corny and presumptuous, but he does it in a very confident Amog way and he says it works.
You can just use a wing to distract the obstacle, but you have to have a really good wing that has the capacity to isolate your obstacle (Which won't be easy since she's fixated on watching her sister).