"The dickgirl is taking all of the centaur's dogdick"
With that word change, the two were no longer thrusting against each other. Erin felt an immense pressure in her lower abdomen as the knot swelled up inside her. Compared to the horsecock, the centaur's dogdick was shorter but no less pleasurable.
Erin squimed on the dick and was rewarded with Trish shouting, "Erin! I'm about to cum!"
Erin could feel the massive dick impaling her tense before releasing a flood of semen into her... whatever was now connected to her pussy. She reached climax then too, crying out back at Trish. Her stomach distended from the amount of fluid trapped inside her, the sensations bringing her own horsecock to climax as well, internal balls clenching as they released their load onto the floor and wall of the bedroom.
"Wow Erin, that was something else," Trish gushed as they both reveled in the afterglow. Erin felt the rainbow centaur shift above her as Trish moved to lay down on the bed, the knot still tying the two together. "Sorry about that, I forgot you're small enough you would get stuck. It takes a few minutes for the knot to die down and you can get off."
"That's fine, Skittles here is doing just fine at keeping me warm," Erin soothed and patted her full belly, still enjoying the unique sensations. The two were fine to just relax in silence.
Erin began looking at the mess she made from her cock. It was splattered on the floor and some was dripping down the walls. She decided to get a sentence from the app targeting herself.
"Erin surveys the large pool of cum she ejaculated."
She idly wondered how things would change if she changed "pool" to "swimmingpool."
Confirming the change, reality shifted. Instead of Trish's bedroom, they were now in an indoor pool room as large as an aquatic center's. Erin could tell this was still a private pool by the sloped wood ceiling. The floor shifted from wood to rubber and the bed was replaced with a smaller cushion. The pool was filled to the top with a white sticky goo; Erin had just filled it up a few minutes ago.
"When you told me to drain the pool, I didn't really believe you would fill it all up. I mean, you don't have any balls..." Trish idly talked to herself before trailing off. Erin's "nonexistent" internal balls did feel different, like they were somehow stretched in a way that was difficult to imagine. She generated another sentence targeted at Trish.
"The dog-dicked centaur is in awe of her friend's semen."