"I never said it would just be a pants-only spanking and besides you agreed to it." Hiroki reminded her before retightening his grip on the hairbrush and continuing the spanking making his sister's backside bounce even more than before.

“Ohhh you’re so DEAD! Ow! Ah! Ow! Ow! S-Stop! Ah!” Yumi complained as the spanks came down once again, the yelps growing ever so louder as her backside was popped. Each smack definitely stung a lot more as her bottom lost it’s main protection. Now he’s probably going to tell all of his friends what color underwear she wears. So humiliating!

"You keep threatening me so I don't think you're learning your lesson on sneaking out. Bad Yumi." Hiroki teases as he continues beating his sister's backside watching it turn from pale white to bright pink in all areas on her backside.

“Ow! Ah! J-Just shut up already! Ow! Ow! Ow!” Yumi complained as she wildly kicked her feet now before reaching back in an attempt to block the spanks now. “Stop! No more! Fun’s over!” She tried to demand from him, wanting to sit down comfortably at some point today.

However, to destroy any hopes of having that happen for his sister Hiroki begins spanking at the girl's sit spots. "Just a few more and I think you'll be done." He teases spanking the most sensitive part of his sister's bottom.

Yumi gritted her teeth in anger and tried her best to hold in her complaints but as her sit spots were tenderized, she let out a chorus of loud yelps as she let out something she might regret. “Ow! Ow! Ouch ! Ah! Fuck! Ah! Ow! Ow! Owww!” She slipped out as she was spanked. When her parents spanked her, cursing only meant big trouble but this isn’t her parents spanking her

Hiroki ignored it as well considering it can use that against her as well as blackmail as well. Eventually, when Yumi's sit spots were as red as the rest of her bottom Hiroki stopped and push his sister off his lap, and unfortunately for her right onto her poor backside.

As the spanking continued with the brush, Yumi continued to let out loud winces and yelps as her butt was now noticeable red underneath the panties as tears were now starting to form in her eyes. But before she knew it, the spanks slowed down and she was helped up before immediately being shoved right on her sore rear as she howled in pain, holding her cheeks on the ground as she glared at him while hoping it was over

Hiroki quickly exited Yumi's room however he also took her pants with him leaving her in just her panties.

Yumi gasped as the pants were taken off her legs, leaving her in just her black boots and purple panties. She growled and got to her feet and began to follow him. “Come here! I need that for school!”