Mixed signals from (straight?) friend.

So I've never been with a guy before, not emotionally or physically. But I'm pretty honest with myself and I occasionally watch gay porn and when I'm drunk I'm 100% gay. So I'm quite certain that I'm bisexual.My lifelong friend, who always came off as a raging homophobe, has been acting weird with me lately. We've known each other since we were 12 and we are both 20 now. We play video games together a lot over skype and occasionally hang out. We're very close.For the most part, though, we often get on each other's nerves and get irritated with each other. It's like we're brothers. We tease and insult each other a lot, mostly jokingly but sometimes not. Lately we've been getting along pretty well and for some reason I've been having gay dreams about him. Romantic ones and sexual ones. I told him about it trying to creep him out but he thought it was funny. And later he said as a response to something "Suck my dick" And I was like "I probably would" "No you wouldn't" "Yeah I will" And he said "that would be weird around your room mate" "Well we can do it once he leaves for work" "Right and how much are you gonna charge me" "Free bro why would I charge you" "Wow you're a real friend"I know it seems like a weird conversation. there was a joking / sarcastic tone to it but at the same time I was surprised with how far he took it without feeling grossed out (like I said. Usually very anti gay)So I guess my question is what are some subtle ways I can bait out his feelings for me if he has any? I can't just straight up ask him because he thinks I'm only ironically gay. He doesn't take it seriously because I don't act too serious about it. But I do think he's attractive and I wouldn't mind trying stuff out with him.Any advice would be greatly appreciated