Hmm, if this is his transformation, he'll be hanging around in your room for a while. After a few days, you'll have a midnight interruption which may give your character an idea. Chat with Mason in R&D to get a focus ready and then visit Michael in your room.
If this is -post- transformation and you've given him permission to act, don't worry. Michael comes to you on his own time. Just play normally and wander and you'll eventually...encounter your new denizen.
Let me know if that helps!