The Doctor looked from the brunette to the strawberry-blonde and back to the brunette again, his eyes wide and panicked. He swallowed spasmodically, desperately searching for a way out of this situation with his hide intact as the strawberry-blonde glared furiously at him; demanding he introduce the brunette, and the brunette raised an eyebrow; daring him to introduce the strawberry-blonde.
"Uh..." he said, shooting a look at Amy and Rory, pleading with his eyes. Help me!
Amy grinned at him, hands on hips, enjoying the Doctor's discomfort. "Awk-ward!" She drawled.
Rory rolled his eyes and stepped in. "River... meet Idris."