Baby Nom

[Moberg]

http://discoverygc.com/wiki/Nomad_Incubus

This should give you a nice read on that subject.
The incubus is more like a parasite which acts as interceptor between the brain and the rest of the body, executing commands on its own to exert control. It does not really alter the DNA, and as such the DNA of any offspring should be unaltered as well. The parasite-like presence of the incubus could result in some unforeseen mutations caused by the incubus during the development of the child though, if you think about it.