Alright... i decided to try something different with Tuck/Speedo, and maybe this is what i need for this:

instead of using Koikatsu, i'm seeing using VRoid. which so far it seems to be easier to make stuff, it also has facilities to export to MMD formats, and surprisingly enough, theres some Tuxedo-like templates i can use to be able to create his costume.

>can you use it for porn?
for default? not really, but much how i have the female models (Pink, Yellow, Ashe), im sure i can attach naughty bits (nips, dick) to the model the same way.

this pic is so far how i got with Tuck's body and proportions, before going to the costume, i want to see if these proportions would work of if i should try to modify them. if more pics are needed for reference, please tell me.

if this works maybe i can use this to make clothing models for the characters, including the girls.