Why her??? I'm sure both of you were thinking this. Oh, the jealousy! Instead, you could have just enjoyed seeing little Lio enjoying herself on your boyfriend's dick. You could have started playing with Mee, telling her how hot Loi looked, etc... but then who would have been doing the filming?
Still, I think it's still hottest when a girl gets turned on by seeing her boyfriend fuck other girls, especially her friends. Don't you think so too?