>poop
In my high school days, my dad was having a midlife crisis and was trying to bone anything within a 10 million mile radius. So he hooked up with a goth chick, and she had a really smoking hot 12-13 yr old daughter, who was also pretty emo and eventually I figured out she was a cutter, because her mom was an insufferable bitch that treated her like shit and her dad was an asshole that sexually manipulated her too. But anyhow, the girl had a very weak stomach and I took advantage of this. On Fridays, our parents would go out on a date. So I was in charge of getting us some grub. I got mexican kielbasa and soda, which I slipped a laxative in. I purposefully waited for her to digest her food and get a stomach ache, then took a long shower until she had no choice but to come in and relieve herself. Before this, she would always sneakily poop when she thought no one was up, but I'd always come in right after and huff the fumes. There's more stories but you get the gist
>piss
I've licked up piss before in the girls bathroom at school. Around the 10th grade I used to sneak in the girls bathroom during gym class. I've scraped shit stains stuck to the toilet bowl, licked up some pubes stuck to toilet seats, and sucked on a few used tampons as well. I stopped around the end of the school year because I heard some shittalkers spreading a rumor that "some dude was sneaking in the girls bathroom" so I just stopped before I could potentially get caught.
>vomit
As an ex-emetophobe, I can say full heartedly that the sequence I'm about to describe gave me a huge vomit fetish. As a freshman in high school, I used to sit next to this quiet spanish chick and would occasionally cop a feel when she got really close. Well one day she must've caught a bug or something, because she grabbed my bag and blew chunks of undigested oatmeal in there and FILLED it. It was funny, she never even apologized and after that day she changed where she usually sat on the bus.