The guy is lucky with his sister - she is a nipple. She's ready to open her mouth for him to stick it in her. Apparently she serves him regularly, because he no longer feels affection for her, but fucks her like a street whore - rough and bold. However, she seems to like this treatment.
If you come to a dark-skinned guy's house, they won't let you chew gum for long. They'll find a use for your sweet mouth. That's what Mia Khalifa quickly realized when a huge pussy went down her throat.