Her tight, athletic ass

Alex's ass must be in extremely good shape, based on how atletic she is, so you grab her and spin her around. Alex realizes you intent to fuck her in the ass.

"No, not there, please not there!", she wails as you give her tight ass a good smack, watching the flesh ripple from the impact. You ignore her pleas, and instead start to add lubrication with you spit. Stacy watches, mouth agape, as you prepare to fuck Alex in the ass.

Once you have added what you consider to be enough lubrication, you take aim and start to push in. She gasps as you do so.

"Well, you are tight alright, Alex. You can thank our dear Stacy for your current situation", you tell her, genuinely grateful towards Stacy as you slowly push into her, her tight ass massaging your dick, even more in its attempts to push your dick out.

Alex is experiencing a combination of humiliation and pleasure, which increases when you start to play with her clit and nipples. She is unable to stifle a moan as you do this, which makes you laugh.

"Enjoying this? Didn't know you had an anal kink, Alex", you taunt her as all she can do is moan increasingly louder. Looking over, you can see Stacy viewing the situation with interest.

"Can't you wait for your turn, eh? Wish you were this slutty before, when we were dating", you also mock her, as she looks away in shame and embarrassment at how she was looking at you fucking her friend.

You continue to fuck Alex for a good while. She tries to resist an orgasm, despite the unrelenting waves of pleasure you give her, and she puts up an impressive resistance. However, she eventually falters, and the pleasure finally breaks through.

Because she held out for such a long time, the pleasure of the orgasm sends her into a massive bliss. In this bliss, she shouts something that you cannot believe.

"YES! Fuck me harder!", she manages to say before she realizes what she just shouted, and covers her mouth in shock. You are surprised, but gladly comply to her request, and fuck her harder. The orgasm made her ass clench even more, and you reckon you don't have long left, but you want to make her orgasm one last time before you are done.

Working hard, you accomplish your goal, bringing her to another mind-blowing orgasm. She moans loudly, but manages to refrain from shouting more humiliating things. The tightness of her ass finally brings you over the edge, and you cum, filling her ass with your cum in one last, powerful thrust.

When you pull out, Alex looks thoroughly humiliated, especially by what she shouted in her bliss. This gives you an idea. You go and grab Stacy, then carry her over to Alex, and place her head in front of her ass.

"Stacy, looks like Alex has an anal kink. Care help her out? Eat out my cum from her ass, or when I've recovered I'll take you hard", you tell her. Alex is further humiliated and shamed by the memory of what she said. The fear of your threat works, and she slowly lowers her face to Alex's ass. You get a chair and sit back you enjoy the show.