I thought I had this one on my favorites but apparently I don't so I'll have to find it the old fashioned way.
Girl A thinks that lesbian relationships are just glorified, short-lived friendships due to her past experiences. Girl B confesses to her out of the blue and refuses to start out as friends. Girl A assumes she's like all the rest and goes along with it. They hang out at school. B takes A to a love hotel and tries to ravage her, but A refuses and reveals her feelings on that gay shit. B resolves to show her that her love is not superficial.