You're feeling down because your now EX girlfriend informed you that she's been cheating on you and wants to break up. Your sister always cheers you up so you go to see her. You tell her what happened and she's infuriated. "That bitch! She cheated on M brother! Wow, you deserve way better. You're an amazing person and you deserve the world!" For some reason this makes you hard. It could be because you're standing over her as she's lying on a bean bag. She notices. "Um... why are you hard?" You compliment her. "Oh you're just grieving it's perfectly normal. I have to ignore that, there's no way this is appropriate". She begins slightly touch herself "Yeah, no we can't!...well may just this once. I hate seeing you so distraught like this. Let me make you feel better". This is exactly what you need to get over your cheating ex