[Doppo being worried about hurting him with whatever animal instincts he may now have makes Hifumi laugh. He's not worried about it himself, even if Doppo becomes something repulsive or violent.]

I wouldn't worry about it. If anything, you can be sure that Sensei and I will keep you in check. Now... [He gestures towards the bathroom.] Please excuse me for just a moment - I'm going to wash my face. Make yourself comfortable. Or perhaps I should say, make yourself at home.