I’ve noticed most people on here with bro/sis incest fetishes or, kinks have at least one sibling or more. But I’m an only (male) child, and yet, still have a HUGE B/S incest fetish. I almost can’t get off without imagining I’m fucking my (imaginary) hot little sister, or pretending whatever girl I’m with is my sister… Would you consider my incest fetish odd or strange since I have no siblings? Have you met or talked to anyone else with this specific issue?

I don’t think that’s strange at all. Most people into incest I know are not remotely interested in the siblings they do have, and several of them don’t have any siblings at all. I have siblings, but no little sister and that’s what I’m most interested in. You’re in good company.