First of all i need to point out a few things before i go into the main question, just to ensure that your help will be more relent to me.
So, main thing is i am autistic (means that i am good at maths and problem based subjects, but i also don’t like human contact and i can’t adapt that well socially) so i am mainly into self-bondage. You may think this is strange really..... someone who don’t like human contact and having such an active mind would like self-bondage, but the reason why is it clears my mind, lets me think clearly, while of curse being fun and exciting to do. But due to this i am also very removed from most social suiterations, and i try to distance myself quite a bit if i don’t feel conferrable.
I spend most of my time, and people know not to go into my room and look about and stuff without my permission (luckily...) so this is to my advantage. But in saying this, there is a lot of people and in the 3 weeks i have been doing rope self-bondage i have had to quickly un do them once as someone came to give me a phone

Next, i am a 17 year old male in the UK and im still at school, this should make it easier, but as i am autistic i only have a few social groups, and my friends number less than 25.... I think (not sure......years blend together) that i started bondage 10 years ago.........it helped me go to sleep, which has always been hard for me, and at the age of 12, is when i linked it to a sexual idea, and i got into using other stuff to help me be bound (and moved away from bed sheets) but only recently, have i really been kind of rediscovering my want to be bound, and have realised that it is not all sexual. Found a few pieces (2x 2m long, 8mm diameter) rope, but last week ordered a lot more.
I have never experienced someone else tieing me up at all. Most i ever got to being restrained was when i was a child, either when i would 'play up' or when i would not take my inhaler (got over the asmpher now) but this was never with items, only with hands, and usually took 4 people for me at age 5.... I am not sure how i will react to being tied up..... but i really want to give it a go but don’t really know how to ask someone or anything..... After reading a lot of stories here i can tell most of them happen by chance really.... but for me that has never happened due to the autism so i feel i would need to take the direct route.
Out from the 25 friends, and maybe another 25 other people i would talk to, i can think of 3 people who might be interested by tie up games, one from coursity and 2 for a rolplay fansity (but i bet would refuse to tie up a male) and the last 2 i don’t really want to ask as they are more likely to tell my group of friends........at which point i would probably want to abandon them as friends.
The first one, i feel like i can trust enough to tell about all of this in person, and that he would not tell anyone, apart from his girlfriend (it would not be in a sexual way, but i think it would be best if she knew anyway) who i also trust enough to not tell anyone. Now, i have always been a bit strange, but im not sure how he would take it, if i explained to him my past with it and then asked him if he would tie me up or would like to be tied up......
Have you got any advice on how i could go about bringing up the conversation with him, and the best way to not offend him (i can be too blunt) when i ask him?
I would want to make clear that it is for a none sexual reason, but i may get excited as for the past 5 years it would have been.... but then also to make it clear that i will help him with some ties and technecks if he wants it. He is another high critical thinker, but he has no social downsides and is very curious on all aspects of life and people, as well as maths and physics stuff. He does a lot of stuff to do with mechanics, and physical labor, so i am not sure how much he might already know.
We have talked a bit together in a past few weeks about my autism as he finds it interesting on how i am able to cope with it, so this may be a good starting point for it all.