A guy kept looking at me at the beach so I went topless to give him a show (F22)

I was at the beach in Spain over the weekend on holiday, and there were a few topless women sunbathing, but pretty much all were just older women though 50+

I was sunbathing on a lounger with my friend and I've never been topless before in public and never thought I would. me and my friend were just in a bikini top and bottom relaxing, enjoying the sun. I've got slightly larger boobs than average (E) so finding a bikini that isn't to revealing is harder than normal.

I noticed a guy to the left with his girlfriend on the loungers behind who kept glancing at me and looking around a lot, I knew he was looking at me as his sunglasses didn't cover his eyes as much as he thought they did lol, so I could see him side eyeing me for a long time.

I got really turned on by the idea that he was with his girlfriend but couldn't resist looking at me, I got up and walked past his lounger a few time because I found it funny watching him just try and hide the fact he was side eyeing me.

When I'm sunbathing I would usually just undo my bikini top when i'm lying on my front just so don't get a line when I start to tan, I could see he really enjoyed this, he was shuffling around, I guess trying to hide his boner maybe.

After a while of sunbathing, his girlfriend disappeared somewhere, so I sat up leaving my bikini top on the lounger and was fully topless, I turned to the left so he could get a proper view, I could see him turn his head slightly and side eye me again, and he moved his legs around, because he was clearly getting a boner lol, my heart was pounding as i've never been topless before, I then got my bikini top and slowly put in back on making sure to give him one final look before his girlfriend came back.

The whole experience was so thrilling.