If she lies she's changing.

"Now for your transformation, if you are lying I will transform into someone else." you answered.

"Excuse me?" your girlfriend asked. "So if I lie to you, I will be change."

"Of course, babe." you replied.

"Well, what happened if I'm telling the truth?" she asked again.

"Well, let me think..." you said as you try to think once more."Oh, I got it. If you tell the truth, you will change back when you are lying, and even you become more beautiful and pretty cute person."

"Okay, that sounds okay." your girlfriend responded as she stressed a bit.

"Don't worry, babe. I'm not going to change you something bad, plus I won't be angry." you said as she looks at you with a weak smile.

"Okay, I guess you're right, hun." your girlfriend responded. "So, what is your first question?"

"Umm... okay, here goes." you said as you're ready. "Have you ever kiss a girl before?"