Sephiroth was right-- but Mello chose to be stubborn. He did not react when he was touched there either, except a subtle narrowing of his eyes.

Some part of him had to wonder if Sephiroth was right, or rather, if it was better to be treated cruelly and violently by his captor. It seemed more natural than softness. It seemed, as he suppressed the shiver running up his spine, preferable to trying to battle pleasure and disgust all at once.