Take full advantage of the situation

"So, you're saying there's at least a few college girls naked and completely helpless out in these woods? And if something happened to you, everyone would be looking in the wrong place?"

The girl paled. "P-please, just untie m-me."

You chuckled. "What would I gain from doing that?" You put the gag back into her mouth before she could answer.

She made muffled protests as you started carefully reworking the ropes binding her to the tree. With careful changes that never left her with any freedom to start trying to escape, you slowly detached her from the tree, then pulled her into a hogtie.

You looked around the woods. You couldn't see any of the other college girls this one had told you were here, but you had no reason to doubt that they were out here somewhere.