I wouldn’t say bound, necessarily; but in my experiences with Lilith and Samael, it’s become clear to me that my work with them isn’t just limited to this life. Also, when I’ve worked with demons, often some of their associates will hang around for some time or permanently. When I was working in the qlipha of Gamaliel, for instance, I had one of the Nehemoth (Night Whisperers) that showed up in my bed on a regular basis and taught me psychic vampirism. Another example: I have a succubus as a familiar spirit ever since I did my first major invocation of Lilith.
And yes, I will insert my standard disclaimer at this point that I know exactly how insane that sounds. Sometimes I have a hard time believing it myself, even, and I’m the one experiencing it.