I think the first time I was tied up was at the age of seven maybe eight. I asked an older girl in the backyard to tie me up with her skipping rope and to make it so that I couldn't get free. She complied with my request and indeed I could not get free. I think she was about twelve years old. I sat quite a long time tied under her desk and felt like I was in seventh heaven
My fantasies of being tied up started a lot earlier, though. So early that some of them are downright ridiculous and could only have originated in the head of a very young child.
After that, I was mostly tied up by boys, peers or, more often, younger ones. I really wanted to be tied by someone older or even an adult, but I was afraid to ask.