=.="
um..... there can be many possibilities for this one....
-They can be brother and sister
- They might be very very close ge friends.
- or.... they are realli lovers.
Maybe it's becoz it's too bothering to buy for another drink. Maybe it's just becoz the girl or the boy wanna have a try on that drink. or maybe one of them has a strong feeling towards the other one.
For whether they are having that kind of relationship, i give 50/50. ^ ^"