Hot Summer Job/Push your sister about her dare
Tormenting your sister is kinda fun sometimes, especially when it's mostly harmless. Might as well carry through, if only to see if she'll do it. "You do remember your dare, right? Naked. Your room. As much as possible. So I'd say you're pretty close to failing right now. I wonder what would be a fitting forfeit..."
"But I already did it all day yesterday!" pleads your sister. "I didn't even sleep with blankets!"
You never said should could sleep with covers, just not wear clothes. But the thought of your tweenage sister laying on top of her bed completely naked thinking she's helpless to cover herself for hours really makes your dick twitch. "Oh, uh, yeah? You did one 'whole' evening? Impressive. Not."
"This morning too!" she adds. "Until breakfast anyhow."
"The dare was for yesterday AND today, sis. A dare is a dare. If anything you need to make up for this afternoon."
"Bro! I'll be stuck in there all night! That's no fun! Especially if mom and dad are gone. Can't you be nice to me this once? Please?"