Furry World: A note on incubi.

In order for incubi to remain in the "real" world, they must, in a nutshell, feed on sexual pleasure. They can do this at a short distance, with anyone, or over a long distance with anyone who has put on an incubi's "token" (a item of jewlery or clothing enchanted by an incubi), but the most intesne energy is always the energy generated by the incubi's own sexual partner.
Incubi cannot feed off other demons. Incubi must feed off mortals to remain in the real world. Other demons may be pleasurable partners, but they cannot provide energy.
Incubi have mind control powers. They can, via sustained touch and an investment of energy, turn a mortal into a willing sex toy. This power cannot be used on other demons, and the mind-controlled mortal cannot be fed off.
Two summoners are required for summoning anything greater than an imp or a lost soul: one to actually summon, the other to cast the spell of binding so that the demon doesn't have more than a few seconds free. More casters may be required for larger rituals.
When summoning, unless a demon is called by name, no specific demon has to respond.
Incubi cum is about 60 degrees... Celsius.
Incubi prefer high temperatures, and "die" (are banished) quickly below about 5 degrees Celsius.
The above points apply to other demons as well, within reason.