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Remember: everything Portal Panties says is made up.

*You sit down on the bus, on your way to wherever you need to go. These new panties are so comfortable, they were such a good buy the other day... no wonder they were so expensive.* *Did someone just touch you? You feel something between your legs. A quick look around reveals that you're alone at the back of the bus. But you can definitely feel something pressing at the hole between your legs...*

NSFW

Portal Panties
You buy a new pair of panties not reading the packaging properly you put them on for your day ahead, getting on the bus towards you work... is someone touching you? you can feel something between your legs. Looking around you're sitting alone at the back of the bus... but there is definitely something about to...
Exhibitionism, lots of cum, oviposition, knotting