Story about brother and sister in college

[Shirtfork]

In this story, the brother has an apartment with his friends off campus. It turns out that his older sister, who he dislikes, lives there and she confronts him in the pool where the friends are attracted to her much to the brothers annoyance. Later on, they play a strip game with Mario kart and the brother and sister realize they like each other.

 

[futakuma98]

I doesn't exactly fit your description, but My Sister Jen has a pretty similar section with the strip Mario Kart.

Link: https://www.literotica.com/s/my-sister-jen

 

[Mandlovu]

Another candidate is "Siblings Strip Away Past Notions" by JayPierce95.
https://www.literotica.com/s/siblings-strip-away-past-notions-remade