Time to get little sister involved

Even as your cum is still leaking out of Katherine's swollen pussy, you're already starting to get hard again. Before, you'd always found it difficult to go back to back in a short time span but Sabrina and Katherine are just out-of-this-world sexy, especially when tied up naked at your feet, their asses begging for another rough go.

But you still remember Sabrina's family photo, three gorgeous sisters by her side. Now that you've got plenty of dirt on two of them, what if you could get another pair of lips sucking your hardening cock? Never in your imagination would you have thought a foursome with three beautiful sisters would be possible, but now, who's to say you can't make that a fivesome, or even invite over a few friends and make it even more? The possibilities are endless although you know you have to continue to be careful - blackmailing will have to be taken slowly as with Sabrina and can't go beyond the point where the girls will rather be exposed than submit.

You grab Sabrina's phone and unlock it. Sabrina is still in too much of a daze to notice as you look through her contacts, until you find a picture of her younger sister. She's got blonde hair and a pristine face, a total knockout and looks like she just turned eighteen.

You send her a text message from Sabrina's phone:

Hey Emma, I'm getting together with Katherine and a friend from work to play some board games tonight. We need a fourth player and I really like this guy, so I'm kind of hoping tonight might get him interested in me? Would you be able to make it? Here's the address.

The response comes quickly:

Hey! Yes, I'd love to meet him and hang out! I'm meeting some friends for dinner at 6 but I'll be right over afterwards!