Why, but of course you should!

This time, at least, there is no need to fake a smile, nor eager obedience. Mandi is on her back, with her legs in their natural, wide-open position, ready for what is about to happen to her. Sam, for his part, is kneeling between them. It's more Mandy's vanity that drove her to give this order than any practical reason. Sam's cock is standing proudly at attention, stiff and ready to do its duty at your behest. It certainly doesn't need your help, but you suppose it does deserve a reward for what it's about to accomplish.

You crawl onto the bed on all fours and smack your lips in anticipation. Anticipation which did not last long, because soon enough your lips find their target. You kiss it, first, sucking up the little droplet of precum which had gathered there. Then, slowly, teasingly slowly, you take more of Sam into your mouth. Millimeter by millimeter, your lips envelop him. Wanting to draw this out as long as possible, you do nothing more. You do not suck, and your tongue lies flat against the invading shaft, unmoving. Halfway down Sam's length, you stop. You look up at him innocently. Well, as innocently as a girl can look with a fat cock in her mouth, that is.

Sam raises an eyebrow after waiting a little while, clearly expecting more. "****, " he says sternly (oh, now it's '****'? Typical.), "I command you to give me the best blowjob you've ever given." Would you look at that. Two orders you'll gladly follow, in the space of a minute. Your 'master', of course, does not need to ask twice. As passive and teasing as you were before, so eagerly do you **** him now. You bring up a hand to hold him steady as you bob and suck with every bit of passion you can muster. After all, the closer you can get him now, the less Mandy will be able to enjoy this magnificent tool. Your efforts have the desired effect, too. Within seconds Sam has thrown back his head, groaning in appreciation. "That good, is she?" Mandy comments with poorly disguised bitterness, "Well, with the amount of practice she's had, I suppose it makes sense. That's enough, ****!"

Ah, but 'master' gave a different order, didn't he?