Is she genuinely oblivious, or is she showing off for him? He is still a man, and no matter how close they are, she reveals far too much. His female friend unconsciously flashes her panties all the time, but today a thong is buried deep between her completely exposed ass cheeks. His restraint finally snaps. He can no longer pretend not to see it, and refuses to believe she could display an ass like that without inviting him. Their long friendship collapses in an instant.