I wonder how NPC's like Rinny, Fawn, Sammy, Alisa, and Gin would react if Lust-Dull took them to the Milk Farm like Lust-Doll did with Cassie.
If you have breasts and are lactating, there's a "training" scene with Gin that implies he'd either run away, or get really into it, much to his embarrassment :>
As for Sammy.. Well, Lust Doll (classic) can give you a pretty good idea. But I won't spoil it. That game is still worth playing through at least once. heh