How can I find /or get the "slime animation" and the other?
You need to craft the "Slime Snack" at Lace's alchemy station in Shiptown, then return to the gym in Safen and talk to the blue slime there. He then moves to Lace's house in Shiptown, where you can find him upstairs. Talk to him, and he'll give you some new recipes for potions that can change his coloration. When you talk to him, you get the option to bone him in various positions. For the other variations, you need to craft the potions he taught you, give them to him, and repeat the lewd events with him in each one of his different forms.