clear as ice and clean as jade (idiom); spotless

"Mmmm ...... don't lick it Wei Dong, I can't take it anymore ......"　　Mom grunted drunkenly, but couldn't resist Dad's onslaught at all.　　It wasn't until he was full that dad stood up, pulled out his meat sausage and shoved it in mom's there ......　　"Oh! Honey, you are so tight here, clamped me so comfortable!"　　But I was hard to hear.　　If the person who stuffed into mom's there was me how good it would be ......　　Thinking back to what mom did to me, and then looking at dad who was rooted to mom, I was in a hurry.　　But, after all, mom is my mom ......