Bite Me

Sasuke could recall two occasions in which he'd told Suigetsu to bite him.

One was simply a retort in response to the mist ninja's jibe about him being 'soft' for his decision to spare an enemy. Clearly, it was just an innocent remark, and Suigetsu would have promptly received an electrified kusanagi to the gut had he made any moves to comply -- jokingly or not.

And as for the other occasion?