Strange Seduction

I know weird title... but this is a story that I had fantasied about when I was talking to this guy online. So yeah here is a young girl whose a care taker to an old couple. One day there grand kids come to visit and Elle though she tries, cannot avoid them any further. Their older grandson seems estranged and Elle cannot seem to avoid him after their first encounter. Elle finds the young man very strange and does not seem to like the peculiar attraction she has developed.