Thanks for the response. Just to clarify:
If HIV infected secretions/blood got under the fingernails, it is still exposed to those air and temperature variations under the fingernails, thus rendering it inactive and permanently non infectious?
I'm not sure what you mean by "HIV fluid," but I will presume you mean bodily fluids.
Exposure to air and temperature variations renders the virus inactive within seconds. Nothing now known "kills" it.
Hand/genital contact, more commonly known as masturbation, is not a means of HIV transmission.
You had no risk.