<human>: Could you distill the essence of the text into 1-3 sentences?

So, basically, I have this friend whom of which I'm not too close with but I still kept in touch because of other mutual friends. So what happens is one day, he sends me this link and me, being innocent just decides to open it. At the time, I was starting to be loaded into this game I play so I click the link, then Alt+Tab into my game. Well, I start playing this game for about maybe 30-40 minutes and after it's over my brother walks in and says he wants to check on something, keeping in mind that I still have my link open on a different window. (I think you see where this is going.) So, I'm just like sure and I change tabs to look at this link, only to find that it freaking some kind of porn site. I  was just shocked and my brother looks up and sees it and misunderstands that I was doing something with it. I'm like too shocked to even explain to him the situation so I just close the tab and continue on to start berating at my friend whom of which sent me the link. He just walks out of room and I'm basically sitting there, just thinking man, now I get the term "It's not what it looks like." Anyway, that's my story and I'm somewhat youngish. I also didn't try to explain the situation because I thought it would kinda sound like I  was trying to cover the whole thing up. Geez. Enlighten me.
<bot>: Friend sends me link and I click it and change tabs to browse reddit. Bro comes in and change back tab and its porn. I am shocked and he just walks out.