i think A's idea of being introduced as a casual friend is good. i've heard it's not good at all for children to be introduced to one's dating partner until it's been awhile so they don't repeatedly bond with people and then have them leave. that would set a child up for emotional problems down the road. 2 weeks really doesn't make a serious relationship. give it a few months and then if you're still serious have her tell the kids you're more than a friend. it's best to take these things slowly.