(Assuming Jeffs sisters name is Alice from this point on)
The next morning you are awoken by the familiar sound of the doorhandle being turned. In walks your sister Alice, straight from bed you can guess as she looks really tired.
"*Yawn*, good morning Jeff, hope you slept well so you are ready for our trip."
You recall that today is saturday, You, your sister and one of her friends will go camping until sunday. Alice has been an outdoorsy person for as long as your can remember. You enjoyed it aswell, but she had allways been the driving force in you actually going.
"Of course, I love going out in nature." you say
"I know you do, as a matter of fact, nature calls right now!" she says jokeingly as she walks towards you while pulling down her pants.
"We will be going up the mountains, stay there for one night and thenb head back in the morning, Sounds good?"
You get no time to resond to her. As soon as she had finished her sentance she plants her face on your face as she has done so many times before.
"Oh sorry, don't answer that, I didn't think before acting. Anywho, Jessica will be joining us aswell, you know from high-school. She isn't too familiar with camping but she will be fine won't she?"
With that she unleaches her morning pee into your mouth. Much more acidic and flavourfull than her evening pee. As she pees she lets go of a fart, as your nose is positioned right next to her anus you get to experience it all. After finishing peeing you can feel her anus doing some contractions.
"hmm, I think there is a number 2 in here aswell." she says
Alice shuffles forward a bit, aligning her anus with your mouth as she arches forward and increeing the pressure on your thighs your eyes are uncovered. You can see up her back and under her pyjama shirt seeing she does not have a bra on her.
Deep in your own thoughts you feel a warningshot from Alice as she lets go of a powerfull fart into your mouth. Her personal entré so to say. Not long after you feel her anus widen and a hot log exits and touches your toungue. She pushes all she got until she gets no further so she cuts it off; causing it to fall down into your throat where you process it to your delight.
"Ugh, this might be a while." Alice says and pulls up her phone and starts scrolling. You can feel her trying above you but to no avail. You hear her scrolling through short form video above you in five second snippets each. After a while you hear her laugh and tells you to look as she passes her phone behind her back presenting it to your eyes. It was a funny cat video that you found funny.
You start to chuckle a bit causing Alice to wobble a bit. She pushes her foot to the ground to regain balance. "Worth it." she says. Sibling rivalery and teasing still exists even if you serve as her toilet right now. Alice finally manages to get the last bit of poop out of her and instructs you to clean her asshole.
She then stands up and exclaims she needs to take a shower and starts to undress infront of you. You simply sit back and watch. There is nothing weird about taking a shower next to your toilet right? She even hands you her clothes to put in the hamper. Alice then steps into the shower and starts showering. Nothing really exiting happens, she just rinses off her body and hair.
When finished she steps out of the shower, reaches for her towel and starts to dry off.
"I assume you allready packed Jeff, as you seem so idle. We leave in an hour just so you know." Alice says as she puts on fresh underwear infront of you.
"Oh shit." You say and head for the door to go pack.
"Are you crazy Jeff? wait until i'm dressed until you open the door, someone might see me you know."