I think you underestimate your closeness, tbh. The fact that he felt comfortable enough with you to tell you specifics about any 'gay' experience he's had, or any sexual experience at all, says a lot. My sister knows I'm gay and I wouldn't feel comfortable even approaching a sexual topic with her, nor would she with me. I envy that a bit.
I always wanted a brother too, though.
Also re: smells... the guy I was dating wore Britney Spears perfume and I really liked him, and my roommate that I'm slowly falling in love with wears men's cologne. So there's nothing to that for me.