you should shag her.....
you want justification...thus you are justified...
why think what if....?
besides her boyfriend wont mind....cos hes not going to find out..
I've been with plenty of girls from many different places who have boyfriends....
If you are not mates with this guy...infact if you dont know him...
then ALLS fair in love and war...
why deny yourself these good times...as a favour to some guy you dont know?
what has he ever done for you?
do what makes you happy...you live once
Happy hunting
