There are other cat-people outside

The labored grunts and orgasmic squeals leave nothing ambiguous: There are indeed people having sex out on the streets. And what people they are - all adorned with brightly coloured fur, feline faces and wanton tails swinging wildly as mixed pairs of men and women seem intent on pulling each other's insides out through the groin.

What on Earth is going on? Is this magic? The result of a genetic mutation? Are humans naturally like this, but we have 10 thousand year long periods between going to heat? In any case, it makes for a spectacular view.

Sophie: "Hohoo, I could watch this all night... But I wonder if everyone has changed, or just my neighborhood?"

The always-convenient internet is your answer to this conundrum. All news sites are raging about a "contagion of the cat-people" in your home city. You turn on an international news livestream. The newscasters are blabbing about something inconsquential, but the scrolling text at the bottom of the screen informs you that: a) The contagion started in your neighborhood b) It turns humans into constantly aroused feline sex-beasts, c) The infected regenerate superhumanly fast from any damage and d) Spread seems related to the amount of fornication that the infected egage in.

Sophie: "Ha... So I'm on the flipside of a plague eh? No wonder I'm still rearing to go after cumming like twenty times today."