When presenting male/female sex scenes I've often made a habit of having the girl be the chatty one. I don't know why I've done it, exactly. I guess to me it feels like the one taking the dick should be the one moaning and dirty talking. While the one giving the dick needs to...concentrate? I guess? It could be I just don't trust myself to write male dirty talk well.
Obviously Stephanie being a futa shakes up the gender formula a bit. But she's still the one giving the dick and it's important to the story to show that she really likes having sex with Morgan. Like, to a degree where she's never felt this good doing it with a woman before. I figure if she's having such an amazing time it would be odd if she was stoic and silent about it lol.