Hello.
This is a guide on how to make a squished penis for bulges, using SBTL (
https://www.xivmodarchive.com/modid/72583). This works for any penis as long as it has IVCS. I tried with sculpt tool once, but found it unsatisfactory due to the penis mesh often distorting in ways I did not like, and being unattached from the legs, causing seams. I never saw any guide on how to do it, and wanted to make one as the bodies I refit to lack any in their devkits (or the devkits I make myself..)
This is, essentially, just using the pose tool on the flaccid penis, then applying it to be the rest pose but with some extra steps in the middle so it actually works. I tested it in game, and it does works without issue. With weights - I am unsure, you probably should just weight transfer from the normal flaccid penis to whatever you're refitting, but who knows. I'm rather bad with those weights.
There is no talking in the video, just text on the screen and calm music in the background from PLA. I would have done the guide vocally, but my disability makes it difficult to speak sometimes and my words can come out jumbled, along with a lot of stuttering. I prefer people didn't have to hear me talk cause of it. Sorry.