Speaking of anal stretching, the jelly/slime monster looks like a great partner for any elf who wants to push the limits. It is not as hard as a barbarian's muscular arm, it can adapt to the shape of the body's insides, it can slide inside the body entirely and to any desired depth, smoothly increasing its diameter without any restrictions. It can be used for anal stretching, as well as for stretching other natural openings of the body, or for training deep throat skills, or finally, just for internal cleaning of the elf's body, entering through the mouth and then exiting through the anus and ureter.
Sasha M