"its okay baby, here you go... all boys like breasts... do you want to feel them? dont be shy, mommy doesn't mind. you used to beg mommy to suck on these every day. do you want to put mommy's nipples in your mouth, like you used to?"
Well, it was definitely a little weird and awkward at first but now all I have to do is whip out my dick and my sis is now all about it. Regardless, our parents are happy we're spending a ton more time together and not arguing at all anymore.