You walk in on your little brother doing this

>You walk in on your little brother doing this
>what do

apologize

>turn 360 degrees and walk away

I'd be very impressed by that dick

>>lock your door dude wtf
he'll say something about knocking
>>what are you, a girl
walk away

help him

>360 degrees

>summer

Ask him if he wants his big dick sucked

Join him.

put my hand on his face and force him to lean back his head, sucking on my fingers while i worship his balls and cock

If my brother looked like that, I would immediately take his dick in my mouth until he came in my throat.

Dubs. Winner.

I'd yell "either you are or I am, but someone's adopted - given dad's dick size, it's you"

Dick appearance is inherited from your mothers father, not your own father.

tell him to spit on it and challenge him to a jizzcontest

You're thinking of hair

[citation needed]

It's a lot of things. Not just hair.

Someone post a link to the vid of this twink jerking it

Stuff like this isn't that clear cut. It takes into account multiple different genes from both parents which can vary hugely through dominant/recessive pairings. Can't remember the name but there's even a element of randomness hard-wired into genetics, where they get mixed up to increase variance. It's not a matter of 'you get X from your dads side and Y from your moms'.

If dick comes from mother's side, does that make it a feminine penis?

Bollocks. My hair looks nothing like my mom's relatives. Neither does my dick.

some prime bro science right there

webcamtwinks.com/video/cute-teen-boy-wanking-and-showing-off-hole/

I'd ask him if he's beating the bishop to Bittany Venti agin.

what i see

>little brother
>little
seems to be a healthy size