"Baby, I am going to put a thermometer in your butt, relax your cheeks", said Mistress, her hands resting on bare bottom.
Whenever she calls me "Baby", I melt, my cock stands up at attention, and my entire being fills up with warmth, she knows that her words have this effect on me, she uses them as she pleases, and I wait for them throughout the day, today I lay naked on my stomach so my cock can only force itself into the mattress and my body temperature will show on the thermometer for sure. I relax my cheeks.
I know her caring gaze is looking down at me, as my body's erogenous zones light up, my hard nipples and cold soles of my feet, i hear her open a Vaseline box, she runs her finger through it as my body keeps overtaking my mind, she parts my cheeks, with one of her hands. I let out a sigh, her touch takes down my final line of defence, I hope do not cum in these sheets, she will be angry.
"Relax, puppy", she whispers as she puts her finger on my anus, the cold wax making contact first, and disappearing in me as her finger dives into me. "Shhh", she coos as I let out a moan, and my hips wiggle around her finger, she controls my motions with her free hand, guiding me to move around her digit deep in my anus.
"Who's a good boy?", she asks calmly as her finger moves around in my opening. "I am", my whisper is filled with lust that I cannot control. She gently removes her finger from me, and wipes it on a towel she placed on the small of my back.
I hear a glassy clink as she takes out the thermometer from the first aid kit she keeps packed with her, she jerks the thermometer around, and checks for the mercury's position in the clear tube, coating the bulb with some more Vaseline she parts my cheeks once again, this time little less than earlier.
"Who's a goo boy?" before I could answers she thrusts the thermometer in my anus, I let out a sigh. My cock is twitching in the bed, my precum had made the sheets wet. "I... am", I muster.
"This will take some time pup, I will be back in a few minutes, stay put", she gently slaps my left cheek and gets up to leave.
"I will Ma'am", I speak before she can leave.
"Good Boy", her smooth voice replies.