Jack saw two little boys playing with their tricycles near the recently grown-up woman. They barely noticed her when the virus started to affect their small bodies.
First, their legs lengthened and swelled so fast that they broke their pedals with their huge manly feet. Then, their asses pumped up followed by their torsos, arms, hands, etc. It happened so fast that the newly grown men crushed their tricycles with their heavier bodies and fell on their butts.
Of course, their kiddy clothes didn't endure against their bulky physiques and now they were almost naked except for their small pants that now looked more like tight briefs and barely covered the improved genitals they got. It was an obscene bulge, a disturbing scene and very funny moment for Jack who was trying hard to contain his laughter as he watched the confused guy clumsily trying to stand up and failing continously.
Jack can see and hear that those pants were ripping off and they would be completely nude in a few minutes. So, they were desperately trying to hide somewhere. Luckily for them, the park has a big rock bridge and they can hide under it. They ran as fast as they could with their new bulky legs and big feet and barely managed to hide when their last clothing finally gave up.
Their new adult dicks immediately jumped out and swayed for an instant like springs. If they were keeping their youth minds they would definitely be freaking out but with their new adult thoughts they just felt ashamed and aroused. After making sure that no one was around, they began to jerk off until their load of cum came out. Of course, it happened so fast, they did it several times until they were exhausted and heavily panted.
When Jack found them again they were sleeping and cuddling. Their bodies were covered in a mix of their recently discovered body fluids and their dicks were so close that Jack thought they were cuddling as well. If this is the effect of his new virus he soon will replace every annoying kid with horny dudes like these. He smiled and took a picture with his phone, not everyday you have an opportunity to get a photo like that!