Want a long/short term relationship

I'm looking for a relationship with a woman who isn't trying to find a life soulmate for once.
I'm also looking for someone who will be around longer than a one-night stand.
To avoid complexity, I want a relationship that will end before I potentially have to leave this area in two years.
And it's important to me that this be more than just a random drunk booty call for the next few months.
Really long term relationships start to get stale when they go past 16 months, so no longer than that.
And if you don't know someone for at least 8 months, the physical relationship never has a chance to really blossom.
10 months is when we would have our first really awesome threesome.
But 12 months is when you have to really think about meeting the parents.

So, what I'm trying to say...is 11 months. I want a relationship for 11 months only, willing to negotiate +/- 2 weeks.