Question: in what episode do elena and damon sleep together
[{'answer': "My Brother 's Keeper", 'provenance': [{'wikipedia_id': '24403874', 'title': 'Damon Salvatore', 'start_paragraph_id': 23, 'start_character': 26, 'end_paragraph_id': 23, 'end_character': 46, 'bleu_score': 1.0, 'section': 'Section::::Television series.:Season 4.\n'}]}, {'provenance': [{'wikipedia_id': '24403874', 'title': 'Damon Salvatore', 'start_paragraph_id': 23, 'start_character': 0, 'end_paragraph_id': 23, 'end_character': 997, 'bleu_score': 0.9896637358043451, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 8833951380452766051}, 'section': 'Section::::Television series.:Season 4.\n'}]}]