So yesterday I had a huge family event which I was very involved in organizing (thus meaning, 80% of the people there I knew and hence I was social proofed for the upcoming 20%).

One of my cousins brought a friend who was really attractive (HB8) however, this cousin of mine and my family don't really get along because she's been rude over the years BUT yesterday she came and, out of the blue, she apologized with me and some other family members she had been rude to. I have no idea as to why, she just did.

I was honestly a bit intrigued but it was a party and I was still going around talking to everyone a bit and dancing with all my female cousins and friends by turns.

After a while I came close to said cousin and asked her "I want to take your friend to dance do you mind?" She said "of course not" so I turned, grabbed HB8's hand and off we went dancing.

I think it's important to say that I had caught HB8 staring my way more than a couple of times and I took that as interest.

Anyway, I began dancing with her for quite a while and we chatted a bit, in the end I #-closed her and got her back to her table to go and continue mingling with the rest of my family.

Here's the thing though, both she (and my cousin) are not living in my city (yet), and they're here only for a week taking a course for school (switching schools).

So, How do I get about asking her out? She will be staying in a house with my cousin. I only have HB8's phone, not my cousin's and as I said, I didn't really talk to her [cousin] until yesterday she apologized. Also, since they're living together and alone if I ask HB8 out, won't she avoid going so she wouldn't let my cousin alone?

TL;DR Met and #-closed HB8 friend of my cousin with whom I'm not really very fond of because of she [cousin] being very rude. Neither of them live here, staying for a week. Want to ask HB8 out on a date but don't know how to go about doing that since they both will be living together here.