This is kinna wierd, I need your help with it?

My best friend and I are both 15. On the gay scale of 1-10, 1 being 100% straight and 10 being 100% flaming gay, I'm a 2. I think my best friend is really really hot and he never showed any sign that he is slightly gay, but he might be like me and just doesn't show it. He's really innocent (he didn't know anything about until I taught him). The past few times hes been to my house, we watched , both and straight. Neither of us did anything (i.e. masturebation or mutual masturebation or took off our clothes) while we watched it. He asked questions about it and stuff like that. After a while of watching it, he regrets doing it so we stop watching. Also he is a strict Christian. How can I get him to do me? I don't know if he's 100% straight or not, and I don't want him to know I'm a little gay if he's not, and I know he is the same way(if he's is gay). How can I subtly ask if he's bi or gay? Also, how can I get him to do me without me being the one to propose it?