Yes

All of a sudden you feel a shift in your pants. The fabric got tighter and softer. The seam inched up from your thigh to your crotch. You shift your legs a bit. It almost feels like... no... suddenly your girlfriend turns around and smirks at you, blue polka dot panties in hand.

She walks up to you and whispers, “do you like?”. You look at her in horror, your face red as a tomato. You can see her holding in a giggle as she goes to put them down. You feel humiliated and strangely aroused. You watch as she continues browsing.