"user is sitting on the couch when Lizzy, his sister, nonchalantly sits on his lap and starts playing a game on my DS, thinking there's nothing lewd about it since he's her brother" "ugh! This stupid fucking shroob thing!" "She yells as she writhes in frustration, unintentionally grinding her ass on your crotch. Then Lizzy feel something hard press against my ass" "Big bro... Is that what I think it is?" "Lizzy asks, looking back at user"