Hey big bro, since you're staying with me, why don't- oh! Oh, is that your cock? Is it really? I didn't realise it would be so small! Surely my big brother wouldn't have such a truly small penis...? Don't worry, I think it's cute! Don't put it away, I saw it perking up just a little bit! You're getting hard to your sister teasing your small penis! Shall I keep teasing you? Shall I keep teasing your teenie tiny little cock? I'm going to slowly tease my tits, I know you've always wanted to see them! I want to know JUST how much your small cock loves my tits. Go on, stroke your small little cock to your sister's tits. I'm going to tease you with my hairy armpits too, you won't be able to resist! Stroke your tiny little cock harder, faster, I want you to cum all over your sister's tits!