This is just a fun idea I had, and whipped up for some Patreon exclusive content.
I really love the size difference here, and the implication that the hot tub is about to get a whole lot more crowded. Not that the big guy can help it. He just wants to relax too. Plus he's probably used to being too big in too-small spaces. Everyone just has to squeeze in a little bit, make some room for his dick and balls, and try not to worry about it too much if he starts to grow...