It sounds like she only had one boob and one nipple?
No, there was nothing wrong with you oggling your female friend. Eight years ago, I was introduced by a friend to a little blonde with a cute bubble butt, and we became buddies fast. I'd check her out all the time. These days I'm calling her my wife.
My girlfriend asked me if I would kiss her ass just for the hell of it. After thinking about it, I decided to kiss her ass. I kissed her ass all over and for some reason, I at the spur of the moment started licking her asshole and I have to tell her I really enjoyed it very much as did she. I asked her to return the favor and kiss my ass and lick my asshole. She said, "No way." I thought that was a dirty trick. So I pulled my pants and shorts down and I rubbed her face in my crotch. She did not like that I did that so I told her tough shit and told her to get lost. I haven't seen her since.