Just the fact that you are so open minded is the arousing part here.I would never force anyone to do something they're completely against or just not comfortable with just because it's one of my kinks. But if it's something they've been interested in but aren't really sure how to go about it, then I would help them to discover whether they liked/disliked said kink.
It definitely turns me on helping the guy (or girl) I'm with discovering what turns them on. But only if they're willing and accepting.
FYI it's incredibly hot for two guys to go at it.
Can't really explain it, just seeing two hot guys kissing, enjoying each other's bodies is just...mmmm lol.