How do you feel about flaccid futas /d/?
Limp futa girls are magical, because they provide something that a lot of futanari art doesn't; make the erection special.
A big soft dick looks so much more seamless on a female body. Something that bounces with her every step just like her breasts, that sways between her thighs. Just look at a soft futa's profile, the curve and line of her body works perfectly with that limp meat.
It makes that moment when her breath quickens and her thighs squeeze all the sweeter. When you can see that angry, throbbing male organ jutting from her body. It's not just a biological sex toy someone put on her, it's part of her, you know that because you've seen it otherwise. You've seen that squishy ballsack move like the rest of her. You've seen her tiny shaft wiggle about playfully. And now you can see it all ballooned and bloated into an organ made to fuck.
One of the hottest things about futanari is that transition from soft to hard, watching her composure crumble and her inhibition take a backseat. The only reason she hasn't reached out and pumped herself to heaven is the prospect of a lover like you close enough to give her a kiss that reassures you'll still love her and her toy whether soft or hard.
You need one to make the other. It's that simple.
I must admit I have a real soft... fuck someone already made that joke.
I admit to having a soft spot for them. I can't really come up with any hard reasons why beyond a solid liking for the rigid, but subjective rule that they at least project that amount of firm realism. That might seem like a flimsy way to think about it but at the end of the day you got to stand up for your standards.