The loli's perspective/I knew Katy wouldn't say anything about it
I figured Katy would be the easiest. She couldn't even talk, so she definitely wouldn't be telling anybody about it. Besides, it really would be easy. After all, I was sorta my job to change her diapers, although I usually just wound up yelling at Lilly to do it. It only seemed fair, I mean my bitch mom made me change Kayla's diapers when I was her age. I was quite sure Lilly wouldn't mind me actually doing it for once though. I announced to my other two sisters that I was going to go see if Katy needed her diaper changed, and then I went off into the bedroom that the 4 of us shared. That's right, there were only 2 bedrooms in the trailer, and all 4 of us kids shared one room. Me and Lilly usually made Kayla sleep in the crib with Katy because she still wet the bed, and then me and Lilly slept together.
Katy was actually asleep when I went in there, but she woke up and immediately started crying when I lowered the crib bars. Her diaper was the only thing she was wearing, so that made it pretty easy for me to take it off. It seemed like she was not wet before I opened it, but that changed the very moment I exposed her private area to the air. She immediately started peeing and she got me on the wrist before I could cover her back up. -ack!- I made a disgusted sound "Awe man! Katy!" I groaned. I was kinda pissed at her, no pun intended. I grabbed her baby blanket and rubbed her piss off with it. "Now are you done peeing!?" I growled at her. "Common! I wanna try something with you." With those words, I picked her up under her armpits and lifted her out of her wet diaper then awkwardly carried her over to mine and Lilly's bed, all the while she just continued to cry and wail. She seemed to be starting to calm down as I plopped her down on the bed though.
I thought for a moment, and I did have the foresight to grab a clean diaper, just in case she peed again while I was trying to have sex with her. I lifted up her butt by the ankles and shoved the diaper under her, and then I simply stared at her bare infant vulva for several long seconds as her crying was dying to a whimper and turning in to coos and other baby noises. She began kicking and wriggling and trying to crawl away, but I grabbed her by the ankles and kept her in place. Finally I worked up the courage to try it. I pulled down my pants and pointed my penis at her slit. My heart was thundering in my chest as I tried to line it up.