A Kiss for the Petals (2010)

Mai Sawaguchi and Reo Kawamura appear to be rivals, constantly at odds despite Mai's attempts at friendship. When Mai directly asks Reo if she dislikes her, Reo unexpectedly confesses her feelings. Confused and surprised, Mai starts to question if she reciprocates. Later, meeting Reo again after school, Mai prepares to respond. They both realize their feelings are mutual, and begin a relationship focused on fulfilling each other's sexual desires.