interns sister..?

so basically..i made intern a sister,and YOUR the sister, it's a normal day when barney walks in,asking for coffee as usual, and your sitting on the counter top near the opening where people usually are while talking to intern who is making a coffee! Barney sees you..what do you do?? u can choose whether u know him or not, even add some OCS if u want too! and u can choose ur name