How do I let this boy know that I'm into him in a suggestive manner?

I've known this boy all my life, he is 15 now, my Mum's best friends son, I am 20, and he will be 16 in August. I remember we where drinking wine in a wine bar garden in up London one summer, we were chatting, we were with his brother and uncle! I remeber saying something and I mentioned something like 'especially when there really good looking like you', he smirked and smiled and like fluttered his eyelashes and sort of blushed? I'm sure he did have a thing for me before, I remember years ago when we were both quite young, we stayed in this house while our parents were out, and we stayed in the same bed, we said we would sleep head to tail, but when it came to bedtime we did so, but then he crawled up near me, and when I moved into reverse back to the head to tail position he said, 'Martin, come and lie next to me!'. He always used to take photos of himself and he would say 'Here that's a nice one of me, I want you to keep it!' or he would randomly get his camera out and take a cheeky photo of me, his brother gave him dirty looks when he used to do that! Also, I noticed if we were ever "play fighting" alone in his room, his brother would walk in and give him dirty looks???? Now I don't know if it's just me being paranoid???? But I Swear he has or did have a thing for me? I don't know though if he is gay because on his facebook profile it says he is interested in Women! Yet he has had status's before flaunting his love of s, LOL, wether they were fs or not he didn't address them! I do really like him though, I've always been really attracted to him, he has always been there, I feel like I can see deep inside him, it's a wierd feeling, I don't know if you understand? It's like beyond on all this cool dude attitude, party animal ****, I feel like I can see beyond like that, It's like I can see his true inner person??? So, could you yse and maybe give me a bit of elaboration and ysis on my thoughts? I am going on holiday with him soon, but he's bringing a friend I think? How could I get through to him that I am really into him without blurting it straight out and having to suffer with possible consequences, how can I let him know in like a sub-conscious way???? Am I Paranoid?