Well, I have many fantasies about that. But the first one I guess I'd keep for a while. For the first week I'd probably just let it get comfortable with me and me touching it. Then id spend a week or two fingering its ass to stretch it open and gape it, rewarding it with food after each penetration to get it compliant. Once It's tiny ass becomes close to accommodating my cock, id fuck it a few times throughout that week, maybe tying it up in various ways just for fun. After doing this for a while I'd start to torture it a bit. I'd love to push needles through various parts of it's body, especially it genitals, among other tortures for at leas a fee. The next week I'd see if I could mutilate it a bit while still keeping it alive. Maybe use my tongue to pull out an eyeball and eat it, maybe break some bones or remove a few limbs, or other things. Next is when I snuff it and after that I'd probably use the corpse for a week or so. Then if I'm lucky and know how, I could create a taxidermy plushie from its remains to continue to pleasure myself with.