Maybe you can try this phrase
"Hi I am her boy friend, do u want to have my number too ?"
As for your gf , maybe you can share this with her ler, we always
believe this between me n my gf,
Before you do something always think, if your bf/gf would do the
same thing how're u gonna feel, what're you gonna do, how would u
like it ? If you hate it, dun do it 
As for the question ask from the very start of this, well, i think
bak bak or not, no issue but most important she's kind as one of
you guys said, kind eyes especially, got heart of love,
sympathy,helpful,xing mu, nice to be with, not heng xin and most
important the feeling and compatibility. Girls who's damn chio la,
sexy la, elegant la, cool la, if the personality is wicked, jeles
fast, mean, heng xin, tok non stop ............ this type no matter
how chio or how sexy ..... fuck it !
