Favourite Paintings - Hellelil and Hildebrand by Frederic William Burton
Or 'The Meeting On The Turret Stairs 

I had to quickly add another as it is very much in the same kind of theme as the previous painting.  This is apparently watercolour and gouache on paper, truly wonderful! 

Such a tender moment between lovers. There are some lovely details, like her hair tucked into her belt and movement is implied by his tunic being caught as they walk past each other. Delightful!