Let's play a game.

Looking at your sister as you formulate her punishment you come up with the perfect way to fuck with her.

"I want you to play a game." are your exact words, immediately she looks at you like you've grown a second head. "The rules are simple, every time you die I get to fuck you once, if you die ten times then I get to cum inside of you for every other **** including the ones preceding it." It takes a moment for her to process what you said.

"Um, ok. W-what game is it that you want me to play?" She's clearly hesitant.

"Oh, that's easy really. I want you to play Dark Souls." She immediately pales. That's surprising given that she wasn't as into games as you are yet she seems to know about the reputation of this game. As you let her try and figure out what's going on you immediately start up the console and load up the game as it takes you to the title screen before you immediately load up a character preset you already prepared beforehand, a perfect imitation of your sister. After doing such you hand the controller to Britney.

She starts up the game after selecting her starting class. She picked The knight class surprisingly, you expected her to pick a mage, guess she's really hoping a knight in shining armour will save her. Before long she starts to get a feel for the controls, learning the movement mechanics and such before moving on through the area. She kills the basic opponents easily enough, she seems to be doing pretty well considering it's her first time playing. But then she gets to the boss and she dies immediately, panicking and running around like a chicken with its head cut off.

Immediately she gets scared and looks back at you in fear. It kind of turns you on. But first things first.

"Well, it looks like you just died, how unfortunate, I guess that means I have to fuck you. However, since I'm not a complete sadist I'll give you two options and a bit of advice considering it was a bit unfair to throw you in blind like that."

Her fear lessons somewhat as she hesitantly asks "W-what do you mean exactly?"

You smile before responding. "What I mean is that you can either have me fuck you immediately after each **** or fuck you after the session has ended. Though before you consider taking either option I will let you know that the session ends when you finish the area. As for the advice, I suggest you stop treating this like a hack-and-slash, stop running around like a headless chicken, stop panic rolling and remain calm. Treat this as a puzzle game and remember everything you learn." You can tell that she's considering what you just said.