Is it normal to have recurrent wet dreams about a friend?

i used to have a strong crush on my mate at school 3 years ago (I've never really considered myself as gay but i'm into some guys, besides that, i'm officially straight). The thing is, when i finished highschool i finally started to forget about him and nowadays we have a normal relationship even though he knows that i like cocks (told him months ago, he gave me his full support), but i started having wet dreams about him, and in ALL of them he's proposing me to suck him off, a thing that i'd have LOVED to do years ago and that's starting to piss me off, i mean why am i dreaming about him when there are tons of people out there?, i thought that i had dealt with that crush long ago. And when he comes around my house he sometimes asks me if i've been fooling around with any dude or something (shyly though, we know it's an awkward question to do to a friend), i would never tell him he's one of my "primary targets", i don't feel like ruining our relationship