She takes the souvenir.

Deciding to accept Ivy's generous and lewd gift, Chelsey nodded to the excited exhibitionist, who spun around and ran up the stairs in the corner of the room, yelling out behind her that she'd "be right back" and to "wait right there!"

Chelsey, doing as such, regained a large portion of her blush as her new friend(?) came back downstairs holding an intricate looking, lacy purple collar, with a little pumpkin-shaped, blank nametag hanging off the front.

"I, uh, figured it would suit you... My mom got it for me to wear as sort of choker a few halloweens ago, but she somehow didn't notice the nametag while buying it, and I was too flustered to wear it back then, so... You can have it! Er, if you want it, that is." Stated Ivy, handing the trinket over to Chelsey, who was equal parts touched and nervous about the gift.

But, deciding to accept her new (definite) friend's gift, Chelsey put it on. It was a bit tight, and it seemed like it would be difficult to take off without help, but the material was soft and warm around her neck.

Saying goodbye to her new exhibitionism "teacher," Chelsey was determined to hit every house on the street now, Ivy's final "You go, Chelsey!" both embarrassing her, and pushing her forwards.

...Or she could still just head straight to the party, considering she had already broken the "rules" anyways. That too.