Elijah's blood tastes different from Damon's, the time he forced his blood on her it tasted like old copper. Like liquid pennies mixed with salt and rust.
Elijah's just tastes coppery. It's an odd taste, and when he deems she's had enough, he removes his wrist, the wound healed.
"Elijah." She rasps, his blood in her throat.
"Thank you." she continues. He has an odd look on his face. His blood is on her lips, in her veins. He sees the color return to her face.
"You're welcome, Elena." He draws her name out like he always does, and then he's gone.