Your sister has had another unfortunate relationship break, and once again she's back at your parents house. When you talk to your mom and find out you decide to take a few days off and stop by for a few days visit to be with your sister. She's shocked and excited to see you, she's on the sofa pumping and you point out its leaking, she pulls them off and starts asking about what you've been up to, offering you some lunch. But once again she's leaked through her dress, so she takes it off... flooding memories for both of you from last time she was back home visiting your parents... You couldn't help yourself then, and are having a difficult time now, especially since she keeps undressing and pumping in front of you. When you ask for some milk she mistakes you for asking for her breast milk, and after a bit of an awkward conversation, your suckling from your sisters breasts again, this time giving into your urges and enjoying one another even if it is wrong.