Not!

"Well if that's your attitude maybe I shouldn't swap us back yet," Josh snapped, irritated by his sister's complaining, "It might do you good to have a different perspective on things."

"Sure, right," Holly snorted dismissively, "You wouldn't last a day being into dudes. The second you start getting turned on by a guy, thinking about how nice his arms would feel around you, how good his cock would feel inside you. You'll be begging to switch back."

She shuddered, the thought of her usual sexy fantasies suddenly deeply unappealing to her. Despite that, she met her brother's eye, daring him to call her bluff.

"You think you could do any better?" Josh teased back, "You'll probably be drooling over some girl's tits and not even realising it before sunset. You can barely keep eye contact with me, and all I've got is these."

He stuck out his chest to emphasise his modest new boobs, making Holly blush at the realisation she had indeed been staring.

This was getting out of hand, she shook her head in disbelief. Her brother had superpowers, and all the pair of them could think to do was bicker about it. She loved the big idiot, but god he drove her crazy!

"Okay, you're on," she heard herself say too caught up in sibling rivalry to stop herself, "we'll keep each other's sexuality for twenty-four hours, and then we'll see who really has it easiest."

Josh blinked, aware that the argument had escalated out of all proportion, but like his sister he never could resist a challenge.

"Fine," he agreed, "in fact while we're at it why don't we..."