Mom recomends a sexfight

“I think,” Heather said, clearing her throat and fanning herself a bit. “That this isn’t about who’s bigger or stronger.”
“It kind of is…” Amy said, but with doubt in her voice.
“I think this is about which of you really feels sexier in your new bodies,” Heather went on. The girls looked at each other, then turned away blushing slightly.

“Ma, I don’t…”
“No, no, hear me out. I think what you two have to do is overcome the barrier of which of you is sexier.”
The girls glanced up at each other again, though more reluctantly. “You mean like a sexfight.” Emily looked up in surprise at Amy. “I’ve experimented,” she said meekly. “And me and sis would sometimes…”

Emily was practically drooling when Amy’s mom spoke up.