Mari finds out in a very "direct" fashion.

Marigold quickly stuffed the disc back in her bag and, almost reflexively, shoved a hand inside and over the exposed naughty bits. Even if the bag concealed the portal, Mari's brain defaulted to believing that something so lewd needed to be covered directly!

The slight twitch of the sensitive flesh beneath Mari's palm reminded the poor girl of just what she was touching. How in the world had she managed to do something like this?! More importantly, how was she going to fix this?!

Mari's mind was so filled with these thoughts and more that she didn't notice the squeal of surprise from the direction of her friends. More importantly, she didn't notice the person stumbling behind her.

"Oof! Sorry!" the stranger said as they bumped into Mari's elbow before carrying on their way.

That small impact was all it took to make things infinitely more awkward. Mari's arm jolted forward, and the chaste blonde felt her heart skip a beat as two of her fingers slipped inside something very warm, very, soft, and very slick. She immediately knew what it was, even if she didn't want to admit it to herself.

Meanwhile, the squeal from earlier was replaced with a shocked yelp, drawing more than a little attention to the woman on the other side of the portal.