Naruto by over double!

Naruko almost choked at what she saw, Sasuke was big and had every reason to think he'd be larger with a cock just over 8 inches and one of the thickest she'd ever seen, and she'd seen a lot. But Naruto's was a monster the likes of which she'd never thought existed outside of Jiraiya's pornos, a solid 18 inches and as thick as her wrist. It was absurd and caused her a unique combination of blinding horniness and animal fear.

Dimly she was aware that Naruto was bragging and Sasuke was more then slightly embarrassed but it was all white noise to her, her brain was dominated by cock. The fact that it was her brother's didn't matter, the fact that it was larger then her largest toy didn't matter, that Sasuke was there and anyone could walk in didn't matter, all that mattered was cock.

So she got to her knees, leaned forward, and planted one solid kiss at the very base, balls touching her chin and eyesight blocked by the dick.