Rapids!

You all head over to an attraction called the "Rocky Rapids", an attraction where you all get your own donut to sit in as you go down a faux rapids. All the girls grab donuts of different sizes and walk up to the start. They all get in one by one and shoot down the rapids, bouncing off the sides and the plastic rocks that line it. Rochelle waits to help you into yours and you thank her

You place your donut in the water and try to sit your butt in it with Rochelle holding it steady. As soon as you're set however, Rochelle steps on your crotch, squishing your sack and forcing your butt down into the tube. Your legs shoot up and your knees almost hit your faces as you're folded up in the tube, your butt poking out the bottom and your head stuck in the top. Rochelle kicks your tube down the rapids and you shoot down the starting ramp, your poor crotch is dragged along the bottom. You feel the harsh material of the the rapids floor pull at your wetsuit, moving it aside and exposing your underwear. It forces your nuts to stretch out and sit under you, almost at your hole. You try and scream as you feel this but your head is barely above water so you just try and hold your breath. This doesn't last long because as soon as you're off the ramp your ass hits a bump at the bottom balls first and all the air is pushed from your body. It feel like this ride is trying force your swollen balls up your asshole! You still struggle valiantly against the tube, trying to bring your hips up when you go down another ramp, you balls pulled and dragged towards your ass as they get pushed into the floor by your body weight. You let out a long moan. You arms are growing weaker, the constant ball smashing and the tube bouncing off the obstacles and sides is sapping your energy. You look forward and just past your legs you can see the finish. There's one more ramp down. "Noooooooo-" you cry out weakly as you slide down the ramp, your balls dragging beneath you, completely flattening. "-ooooooo... OH...". Your left ball was being squashed beneath your butt but your right had slipped up between the crack. Seems the dragging had really stretched your sack out because you felt your right nut slip into your ass. This would hurt normally but with your swollen balls it was agony.

You finally land in the pool and as your strength leaves you you slide down into the ring and the water. You can just barely touch the bottom and poke your head up in the ring. You feel down in your swimsuit tentatively to check if you have girl balls or a sack full of paste. You find lefty, hugely swollen and slowly tug at your sack to pull right out of your ass. It pops out and you shudder. Your underwear is completely ripped apart, being less sturdy material than the swimsuit. You pull it out from under yourself and let it fall to the bottom of the pool. Your try to look down at your crotch in the water to see how it looks without the gaff. Your dick is pretty shriveled from the cold and the ballbusting, so it's not a huge problem. Your nuts are so swollen they almost look like a fat pussy , if with a little sack skin poking out the side. You hope noone notices as you hop out, holding the tube.

Rochelle and the girls are waiting for you, laughing about how fun the ride was, apparently not aware of your troubles.

They all excitedly agree on the next ride

Ball swellatude: 40%