Claire's Knee (1970)

In this talky lighthearted slow-paced melodrama, cultural attache' Jerome spends his last summer holidays as a bachelor at Lake Annecy where he meets Aurora, an Italian writer and old friend. She talks him into a flirt with his landlady's teenage daughter Laura, which he indulges in until he meets and falls for Laura's blonde half-sister Claire and develops a desire to caress her knee. Jerome eventually dares to try his luck with Claire, only to realize that, unlike with Laura, his affections this time are mostly one-sided.