After your girlfriend pays for your new feminine clothes, you continue to browse the store for anything she might like. Your embarrassment at being seen with her in the lingerie section has been replaced by your embarrassment to be seen as a girly boy. You hope, at least, that your girlfriend was right about people easily mistaking you for a girl.
As she continues to look for new bras and panties, she engages you in the shopping, asking her how you think they'd look on her. You're glad to feel the same old arousal when she proposes a particularly racy set of red and black lace. Despite the freaky powers she's exhibiting today, you still find her to be one hell of a woman.
You surprise yourself as you start taking a genuine interest in her search for underwear. You pay attention to the sizes and styles she talks about, and look at all the different manufacturers and their different qualities, analyzing them as if you were looking for a new pair of pants.
"Maybe we can get you a training bra," she giggled, holding a pair up to your chest. You swat it away and turn bright red. "Just kidding, honey. Okay, let's check another store. I'm not seeing anything here."
You walk out into the mall and notice as you go that you're moving with a more feminine gait. Your hips are swaying a little bit and you're moving your head slightly to give your long braid a nice swing. You try to stop this and walk more properly, but it's difficult to resist the subconscious urge. You hope you can make it through this shopping experience without damaging your ego any more than it already is.