I've got a good bit of my own dick in my mouth before. I haven't done it in forever though, I did it in my teenage years a lot because of how horny I was. I was awkward with girls as a teen, so I didn't get laid until I was 18. I got my nickname because there were lots of girls that would, I guess, be brave enough to talk to me and call me "big Nick with the big dick"; my wife, who I met in high school, told me that most of her friends were afraid to talk to me (I'm sure they were also waiting for me to approach them. I missed out on a lot of pussy lol). I was naive and shy, so I didn't know they even noticed me, let alone took the time to look at my dick. I was so bad, that I didn't even know I had a big dick at that time, so I wasn't aware that I had a bulge worth looking at.
I guess being able to blow myself should have been a sign that I had a fairly big dick. I liked it, it felt good, but I would always feel a little disappointed in myself afterwards lol. I like the feet-over-head method, and I'd get my feet under the bed frame or the inside the bathroom cabinet so I could kinda push my hips up and down to fuck my own mouth. I'd cum in my mouth, spit it out, and then always say that the next time I'm going to swallow it. I never did lol and it started hurting my back so I stopped.
Not gonna lie, it felt amazing at the time