As far as naga preggo goes I'd say if it matters that way write it and give it to Savin/Ged/Fen. If it's true to the Naleen, then I imagine Savin will be all, "Whew! One less thing to have to do, and it's close enough to how I'd do it that I can let it be legit.", or somesuch like that.
When it comes to PC preggo with naga body, there isn't really that much difference other than the whole, ". . . you spread your { pc.legs} wide to help get your wonderful progeny, whose father you are currently wishing all of the deaths upon, more room to get through your rapidly widening vaginal passage." Which rarely if ever treats your tail properly. But to be honest if you play naga body and are NOT used to covering up for that crap mentally during gameplay, you're basically cutting your own (lady)boner out of your own life.