Clearly nothing embarrassing.

Although it is something surprising. Surprising enough to make Madoka stop trying to move through the crowd for a moment. Instead she freezes up as she feels the other's forehead move against her own, her cheeks heating up a tad.

"Ah.."

It's nice. And warm, and affectionate. And so her surprise slowly melts into a smile, not caring who else may be around at this point.

"O-Of course I am! I wouldn't let you worry about me, you know..!"