"Now for your transform, you're going to change into a completely different person when you change your personality." you answers to your girlfriend as she raises her eyebrows and curious.
"Wait what does that mean, hun?" she asks.
"Well, you're changed into a different person when your personality changes. Like um... Dr. Jekyll and Mr. Hyde, Hulk when Bruce Banner gets angry. Or even like Launch from Dragon Balls when she sneeze." you explain to your girlfriend as she finally understands what you're trying to say.
"Oh I see, now I get it, hun. That's very interesting." your girlfriend replies. "So is it like, I have some Multiple Personalities that I can even change into different person?"
"Yeah, you could say that." you awkwardly say.
"Wow, that's really rare." your girlfriend replies. "But do you know how my transformation work?"
"Well, um... I don't know... what if you black out as you're becoming someone else." you asks
"Well, let me try..."