Okay, you got my attention! This promises to be a really hot story! This one sentence especially got my fantasy going: "Already your skin is a little darker than mine, and you need to whip it harder to mark it." I understand, you're talking about Angela here... but having to whip her skin harder to mark it? I mean, sure, if that's the objective! Do you like seeing her marked? Or have your own body marked too side-by-side with hers? But I guess I should not get ahead, but let you tell the story. I can't wait for the next part.
oh yes, thanks for the comments, I'm glad I made you horny, at first it was just an image to explain her skin tone, but we will come to the whip.