"Gosh, Becky, you've got really nice breasts," Kelly observed, causing Becky to blush as she reached for the t-shirt. "They're bigger than mine and your nipples are really dark."

"They are not bigger," Becky protested, embarrassed.

"Sure they are," Kelly said, pulling her shirt up and moving so that she was standing right in front of Becky, their nipples only a couple of inches apart. "See."

And indeed Becky's breasts were just larger than Kelly's. As Becky stared at Kelly's breasts so close to her own, she felt her nipples contracting and getting hard, so she pulled the t-shirt on over her head as Kelly dropped hers.

"Ready?" Kelly asked,...