Sudden non-popping expansion virus

Original way of virus spread is water. Unboiled tap water is a guaranteed way to get infected. Random bottled water is infected too, only safe is alcohol and sweet drinks.

Secondary virus spreading through people at first stages through body liquids (saliva, genitals, blood). Don't contact with their sweat, saliva, piss, and don't have unprotected sex with infected, it will cause the infection to spread on you.

User will get infected if user: licked the sweat of infected, breathed in air that just breathed out by infected one, breath in too much smell that infected emmites, have contact with genitals of infected (any kind of sex), kisses the infected one in lips, had too close contact with infected one, drink any body liquid of infected one.

On very first stages of infecting personas body gets warm as hell, it pains red and feel really hot. Their behaving changes, infected becomes ultra horny and mindlessly will harass nearest people trying to have sex with them or get them infected in any possible way. They will not wait for consense, infected drive crazy and will do anything to infect anyone while infected body isn't transforming yet. Transformation starts only about few hours after getting infected, all time before it they will spread virus as they can. Infected will try to kiss people succesfully or not, will undress (even in public), and will cling as close as possible, including raping with no permission and heavily harassing. If infected doesn't find cooperation - it starts to act, infected will force kiss without consent, or undress in front of, and will initiate forced sex.

Expansion stops when infected fill all space in the room, or when become immobile.

That ones who learned now able to continue transformation on their own, or stop, or reverse it. Also they can stop spreading virus from themselves if they want to.

Virus isn't guaranteed of any type of expansion. It only does activates the already most developed mechanism. It attacks a 5 ways: Breast expansion - mostly problem of girls that already has big boobs. They're expanding and inflating to impossible sizes, filling with milk. Ass expansion - problem of heavy bottomed ones (milfs, gym girls and more). First their ass become more jigly and fills with fat, but then fat rushes into whole lower body, expanding their legs and ass to impossible sizes, turning them into hug inflated fat silos that jigle at any move. Weight gain expansion - if there's no big boobs, no big bottom, but some fat tissues. Mostly problem of average sized girls and males. Virus forces all the fat tissues multiply and explode in size. The persons growth is literally visible, they gaining to immobile blobs in hours, but because this - their skin can't grow that fast and as long as skin tries their best to hold all this mass together - it still covers in horrible stretchmarks. Belly inflation - when there's now boobs, no bottom, no fat, or subject is contacting with water so much. Body just starts to accumulate all the water in belly, and drinking water from air humidity. Blueberry inflation - mostly problem of diabetes and sweet lovers. Mechanism like belly inflation - no boobs, no ass, no fat. Mostly problem of fit girls, sporty girls, and males. But it focused not on water only but on sugar in body too. It filling all the tissues with liquid, then filling the chest and abdomen cavities. The liquid is blue, so filled tissues painting in blue as they fills. Body fills with renewable liquid and sugars, emitting the infected spores, before it somewhen stops.

Subject could expierence only one type of transformation at once. No hybrid transformations.

All types of expansion are start not instantly, only after few hours, and after transformation starts - providing pretty slow, about half of a day (12 hours) before final stages, so from the moment of infection there's enough time for do something.

There's a way to provocate type of expansion if got infected. Belly inflation may be provoked if before start of transormation drink a lot of water. Ass expansion may be provoked if before start of transformation force blood vessels work at rear (do extremely fast squats or climbing on staircase), same with breasts expansion - squeeze it and massage it like last time and you'll get boobs expansion. Blueberry may be provoked if before start of transformation eat sweets as hell, rushing sugars into blood.