Girls are smart. They probably considered the fact that they would want to live with someone who they feel like they can trust. No offense but I doubt they'd ever opt to live with someone who they were attracted to unless they are gluttons for punishment. That could end horribly. I'd never want to walk around in my grubby jammies around some guy I had the hots for.
I'd consider it cool that they chose you and go into it thinking they are not even females really, just roommates or even sisters. Respect them and they'll respect you. No sexy sexy time with them. Maybe use it as an in to meet their friends, but they need to be off limits.
So, so you think you can tell Heaven from Hell,
blue skies from pain.
Can you tell a green field from a cold steel rail?
A smile from a veil?
Do you think you can tell?
And did they get you to trade your heroes for ghosts?
Hot ashes for trees?
Hot air for a cool breeze?
Cold comfort for change?
And did you exchange a walk on part in the war for a lead role in a cage?