Surprise

I was laying on my tummy on my bed, naked since i just took a shower. i heard the door being open and i smiled, knowing it is my mommy. she took a sit next to me on the bed and pulled me closer to her, she told me she loves me which i said back, of course. she massaged my back and patted my butt then she told me "monmy has a surprise for you" i smiled wider and asked "really?" she told me "yes really, close your eyes and count to tree", i closed my eyes and counted "one, two-" suddenly i felt something long, thick and cold sliding into my hole and deep into my rectum. i sqirmed and whined. mommy laughed as i cried "no mommy" all she did was to twist in the thermometer while holding my cheeks open, "now little one, hold this thermometer deep in your butt" she said as my hole clenched so hard on the thermometer, sucking the thermometer in. "this thermometer has to be deep in your little asshole for at least 6 minutes. now i know it is big, your rectum must having fun holding it huh?" i cried and clenched even more. all this time she keeps moving around the thermometer and then she pulled in out, looked at it and i smiled cause now it is not in my butt but not a second later, and the thermometer has found itself deep in my rectum again. "was not deep enough" i heard my mommy says as she pushed the thermometer deeper, after a long time she pulled it out, my hole clenched on nothing. she slapped my butt and told me "now how did you like mommy's surprise." i just held my butt cheeks in my hands and closed them together, she laughed and said "oh sweetie, you can clench your hole and close your butt all you want but you know this thermometer will find its way deep into your butt again." while shaking the thermometer in the air.