Straight and engaged but been curious since she’s gone….

So I’m normally a dominant, straight guy. But lately for some reason I’ve been craving a huge cock😅I have no clue why lol. And then my fiance left for vacation this morning and all day I’ve been pumping to cock and now am even thinking about sucking and getting fucked by one. Why am I getting so horny over the thought of sucking a nice huge cock?