They walked in to the room and let the door close behind them, finally alone. Instantly they were in each other's arms, kissing hungrily. Suddenly she broke the kiss,
"Easy now pet, plenty of time for that. I'm going to go and change, why don't you undress for me". With a smile she walked in the bathroom.
When she came out the boy was naked, blushing as she saw him in the flesh for the first time. She was wearing an almost sheer lace top, her breasts straining at the fabric, and a pair of lacy knickers, the material clinging to the shape of her womanhood. They both gazed at each other lustfully for a moment, his cock already twitching, her lips slowly moistening.
"On the bed, and assume karta for me pet" she commanded.
He climbed on to the mattress, and took the position, leaning forward on to his arms, arching his bottom up. His legs nicely spread, his most intimate parts were left open to her gaze.
"There's a good obedient pet" she said, resting her had on his head, running it up his spine, and pausing at the cleft of his buttocks.
"We're going to start with an inspection. You're offering me your body, and we have to make sure it is worthy. You certainly look fit and healthy. Good firm buttocks," she continued as she squeezed his bottom in her hand, before placing her fingertips between the firm globes.
"What a pretty anus you have pet" she said, tracing a finger around the rim of the crinkled opening, causing him to moan softly. She ran the finger down over his perineum, noticing how sensitive both it and his anus were to her touch.
She took his scrotum in her hand, squeezing gently, rolling his testicles between her thumb and finger, stretching the sac out.
"All seems very healthy pet" she said to him, as her hand continued its downward journey, fingertips running down the underside of his already stiffening cock.
She smiled to herself, pleased that this young subbie's near constant arousal was entirely down to her. Wrapping her hand around his shaft she expertly began to masturbate him, leaving him fully erect in seconds.
"Mmm... you are a nice size pet, Mistress is very pleased."
"Thank you Mistress," the boy replied, blushing at the praise, and his exposure.
"Later you'll show me how tight your body gets as you cum" she told him, continuing to slowly stroke his stiff cock, "but you can't cum just yet pet. You must earn your cums by being a good little boy, and pleasing your Mistress. You do want to please your Mistress don't you?"
"Yes Mistress" he breathed, "I live to serve and please you."
"Good boy, such a good boy" she praised him, slowly masturbating him until she could hear his breathing become heavier and little whimpers of pleasure could be heard, before abruptly stopping, leaving his erection hanging between his spread thighs, the tip shiny with pre-cum. Rising up from the bed and walking to the dresser she spoke back over her shoulder;
"Reach behind yourself for me my love, and spread that beautiful bottom of yours nice and wide. I want to see your hole open for me."
At the dresser, she opened a pot of her favourite lube, liberally coating two fingers with it. Turning back to the boy, she observed with a smile that he had done as she commanded, his hands pulling his buttocks apart, with the result that the crinkled pink opening between them was wide open on display.
Returning to the bed, she knelt behind him, admiring him for a second. Grinning to herself wickedly, she leant down and kissed him between his spread cheeks, her tongue darting out to press past the rim of his anus.
"Oh Mistress" he cried out.
Chuckling, she ran her tongue up his perineum across his hole.
"Like that do you boy? If you're good maybe you can have more as a treat later."
He made to answer, but groaned deeply as her lubed fingertips found his anus for the first time. Rubbing lube against the outside of his hole, she pressed one finger inside, slowly sliding it in to the knuckle. Withdrawing it she pressed two against him this time, and smiled down at him, pleased, as his body easily took both inside.
"What a good boy, so tight and warm" she purred, "though I think we'll need to stretch you before you're ready to be used properly."
She slid her fingers in and out of him slowly for a few minutes, twisting them as she did, massaging his prostate, enjoying the feel of him, and the sight of his nicely stretched rim. Then she withdrew her fingers, causing him to whimper slightly in disappointment, his hole closing up tightly.
"Right, where is it, ah this one should do" she declared, pulling a medium sized butt plug from her bag. Turning back to him she commanded,
"Keep those buttocks nice and spread for me sweetie, I need your hole open for this."
Kneeling behind him again, he shuddered slightly as she placed the tip of the plug against him. Pressing gently but firmly, the tip slid in to him, his tight ring stretching around it. She reached around and stroked his cock lightly, offering encouragement, whilst he grunted as she pressed the plug firmly in to him.
"Good boy, relax, press back against me, there you go" she cooed as the plug's widest point slipped past his sphincter and he closed up around it, with only the flared end left outside.
"Now we'll leave that there for a bit whilst we warm you up some more, externally" she chuckled. "Put your arms beneath your head again and raise your bottom up."
As he did as commanded, she continued to talk to him.