>>11357668
nta. tested this myself.
(2girls melting fusing merging together:1.8), (conjoined, fusing, merging, melting, slime (substance):1.8), (body horror:1.4), goo transformation, sweat, shiny skin, oiled
using these tags gets decent results.
https://files.catbox.moe/b5fmlw.png

if you need a lora for this concept specifically you should go look for good lora makers accepting commissions on civit.