Yes!

It's like you're a passenger in your own body... a body that's strange and alien in so many ways, like how your hips move on their own in a blind, animal need to feel more of the pleasure that's coursing through you, making your hands tighten and your mouth drop open with a silent groan.

You know you should stop. You know this isn't right, it's ****, it's your sister, you're **** your sister, but it feels so good, why does her body feel so good against your cock...

"Sorry," you gasp as your hips grind forward, "Sorry, sorry, sorrysorrysorry..."

The only part of you that seems still in your control somewhat is your voice, and you just keep whispering that word as you press another inch into your sister, then another, until...