I am not proud of this. I was in the 8th grade when it happened. My best friend had a girlfriend with really huge tits. We went to a water park for a school trip. He couldn't show, so I made his girlfriend company. I was staring at her tits in the two piece bathing suit, so they definitely "popped out". She must've noticed or something, so she made me grab her tits. I was getting so hard, she noticed. We went to the wave pool, and I fingered her in there. We don't talk anymore, and he and I aren't friend. Kms