don't lie to nii-chan yuuki, we watched you and your classmates
oh no, so did nii-chan. maybe he didn't notice that part
"you''ll get in trouble for having your dick out" puts his dick in her mouth as soon as she can. yuuki, you just took those off him cause you wanted to suck his dick
now...
i think he probably has the internet so he should be able to see a boob even if he's never touched one, but he doesn't draw boobs like someone who can look up what a boob looks like on the internet