Well it's confirmed: it's the 15 year old.
My mom kicked him out the house on friday because he wasn't listening to her; she sent him to my place, which is currently under renovation. I've been shacked up with my parents so he was the only person at my place...with my computer.
I give him credit: he didn't go to any porn sites on my computer. So at first I breathed a sigh of relief figuring that it wasn't them. But with a bit more investigation into the history I found lots of youtube hits...questionable youtube hits. Decide for yourself
[youtube=425,350]q6F03KEfaQo[/youtube]
[youtube=425,350]wHFKDZQ-R24[/youtube]
[youtube=425,350]xJdnoQCsWsQ[/youtube]
[youtube=425,350]yGMKgLRU-3c[/youtube]
[youtube=425,350]XxKFuEtPxIw[/youtube]
And no, he's not into working out/bodybuilding of any type. I could understand this a bit if he was working out, but...yeah