Same thing as Emma's

"I... can't explain it...!" Hannah sniffled as she turned back to her sister, then looked shamefully to the floor while trying to steel herself.

"Hannah...?" Emma told her, as gently as she could, while walking up to her little sister and putting her hands on her shoulders. Instead of accepting the embrace however, the girl backed slightly away from her, and it finally dawned on her just what the 'problem' might be...

"It's so weird...!" The poor girl stuttered, and then reached for the waist of her pajama pants. As she pulled them slowly off her hips she proved the assumption to be perfectly right, and Emma could barely keep from grinning at the sight of her sister's new cock.

In every way it was exactly like her own, complete with a bared set of balls, though perhaps just a little bit smaller - so to fit on Hannah's frame. Still it looked absolutely huge on the girl's more slender frame, even in it's currently flaccid condition.

"Oh, wow!" Emma stared at it breathlessly, though her excitement was apparently misinterpreted as shock by her sister.

"Yeah, I know!" Hannah continued to sniffle pathetically, and then whimpered while the thing started to slowly rise and swell between her legs. Desperately she tried to stop it by grabbing around the girth with her hands, but instead seemed to only hasten the process. "Ohmygod, not again!"

Meanwhile her sister was watching with growing arousal, and a big grin on her face, while her own new member made itself reminded off once more...