Make her do anal.

Well, even after being altered with the coin, there had been one sexual taboo that Sarah had never been willing to budge on, now matter how much Tom asked. If this had really worked, she wouldn’t even show token resistance to the idea. “If that’s the case, here’s my real first command: go get some lube, strip naked, meet me in the bedroom.” She nodded and walked away, and without looking to see what she was doing, Tom walked into the bedroom and got naked himself, his cock already hard for what was going to happen next.

Sure enough, less than a minute letter, Sarah had joined him, holding a bottle of lube made explicitly for sexual purposes, bought years ago when they’d first started having issues with lubrication on the occasions they had sex, and completely nude. It was exciting, Tom had to admit, looking at his wife now. Always more than a little willful, an equal partner in life, she was now utterly subservient to him. Really ready to test if that was the case, he gave her more instructions. “Use the lube on my dick, then on your asshole. Once that’s done, Lay done on the bed, belly down, and stick your ass in the air.”

If Sarah had even a single objection to what he’d said, she didn’t show it at all. “As you wish, Master Saunders.” She squirted some lube onto one dainty hand and knelt down to properly slather it all over his cock. The feeling got him even harder, but once she got him properly covered, she added more lube to the hand in question and reached behind her to finger her asshole. Moving so he could see better, there could be no mistake: she was doing exactly as he’d asked. Then, she got into the exact pose he’d described on the bed, ready for him.

Getting behind her, in a not dissimilar position to how they’d often fucked doggy style over the years, Tom grabbed her ass, but before he started, he gave her a few more orders. “You will feel no pain from the anal sex we’re about to have. In fact, it’s going to feel even better than it would in your pussy, and you’re going to orgasm multiple times from it. After I’m done, you’re going to want me to do it to you more.” He got only a muffled moan in reply, and that’s all he needed. His cock slid into her asshole easily, and soon he was thrusting inside her, unable to believe how good it felt. Her sphincter gripped his cock so much tighter than her pussy ever had, and it was clear from the restrained sounds of pleasure Sarah was moaning into her pillow, she was loving it too. He felt her shudder in orgasm once, twice, three times before he finally couldn’t take it anymore, and filled her ass with his cum. Drunk on power already, Tom looked at his ass-fucked servant and told her, “Go to the bathroom and clean yourself up. Then, come back in here, and I’ll have more orders for you.” She complied, and was soon in front of him once more, still naked, but now with a clean asshole. He knew she’d really do anything he asked, so now he had more ideas to try on his servant.