So I posted this on another subreddit, but had to omit some particular NSFW details due to the nature of the subreddit. So now I'm posting the whole story after talking to some people about it.
I'm a 25yo guy, been wearing thongs for like 6 or 7 years now (although been curious about them since I was a kid) and for the past two or three years I've been trying to be more confident with my thong wearing besides just like having it on under my clothes.
I've gone to a clothing optional beach near me and worn a thong there (but usually end up naked anyway), and when I have the opportunity to dogsit I use their backyard to tan in a thong with some privacy. The house isn't fenced in all the way, and a couple sides the fencing is just like wire. Well, yesterday I'm laying out in my thong and reading and I look up to see this guy standing at the waist-high fence and when I see him he says hello. And I say it back.
Inwardly I'm panicking because idk who this guy is and I'm nearly naked and kinda embarrassed a bit about the thong. And he says he's a neighbor and he was just dropping by to talk to "Mary" (person I'm dogsitting for).I told him she was out of town, and at this point I'm standing up. I thought about wrapping a towel around my waist but he's already seen my thonged cheeks anyway so I thought it would be better just to confidently own it.
So I walk over and we start to chat. Now, I must admit I do wear thongs for comfort and aesthetic, but I'd be lying if I said there was no sexual undertone. And so for this presumably straight man to not even bat an eye at me basically in nothing, I start to feel a bit aroused. We never mention the thong, and I'm slowly getting harder and harder. And he keeps glancing down during our conversation, and I know after a certain point that he knows I'm getting hard. And he still does not acknowledge it which turns me on more. Meanwhile we're having a great conversation, but for like the last 5 minutes of our 15 minute convos, I'm rock hard. And it's very noticeable, I mean there's just not a lot left to the imagination in a thong and even less with an erection.
Finally he's like "well better let you get back to the sun" and so I say it was nice to meet him, and this is where it gets wild. He reaches over the waist high fence and he wraps his hand around my head thong bulge and tugs/strokes it a bit while saying "no it was my pleasure to meet you. And I'm just so shocked but very turned on. I nearly blew my load. I had no idea it was coming because he hadn't mentioned my thong or my erection and he'd referred to his wife and two children in our convo. And he just generally gave fully straight vibes.
But we say goodbye and I start walking back to my set up and I hear him say "by the way" so I turn back and he's still there and he just said "keep on rocking it" and then he turned and started walking away so I go back to my setup. Immediately I get on my knees and I pull the front of my thong down and I start stroking. And I'm like on a mission because I'm so fucking horny and I blow my load in less than a minute or two.
My back was to to where I was just talking to him. And as I'm catching my breath and just coming down off the high, I hear a whistle. I turn and he's still standing there, not at the fence but a way's away. And I guess I should've triple checked that he was gone, but I was just so horny I wasn't thinking straight. And so when he saw me kneel down and very clearly stroke, I guess he decided to watch. He didn't really see anything I guess except for my thonged ass and my arm stroking. But knowing he watched the whole thing was enough to get me nearly rock hard again.
And he just yells and tells me next time I'm dogsitting for Mary to let him know, and he told me which house was his and this time he actually walked away.
It was the most erotic pseudo sexual experience of my life.