Mycroft was in too much sudden pain to say anything much else, but within seconds he sported long fangs where his ordinary human teeth used to be. It was all over in another moment, and he just stood (or whatever the equivalent was for a snake-man was) there in an attempt to recover from the latest shock.

"This is insane, when will it end!?"

His words sounded somewhat garbled and uneven, between the forked tongue and the big ol' teeth his mouth was fairly crowded. Or at the very least, he wasn't used to them enough for his speech to be unaffected.