I should warn you that while there are lots of sites out there with gay porn, finding twink-focused ones isn't the easiest thing to do in the world. As such, my recommendations are to be taken as relative to one another in this category. Don't get me wrong, I'm not going to recommend trash, but still bare that in mind.
Anyway, admin aside, Twink BF Videos is a premium site that offers you amateur-style porn clips of young guys getting fucked by their boyfriends. Note that this is 100% twink action and as far as I can tell, most of it is genuinely authentic and amateur. The site currently has 130 scenes with an average length of around 5 minutes being consistent across the board.
It doesn't update any more and I don't think the material is exclusive. That said, you do get free bonus access to six other sites including Black BF Videos, 429 Videos and Amateur BF Videos. It's a pretty good network considered, but by itself, I don't see Twink BF Videos getting a top rating.