What do you think?

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I'm an 18 year old male with a somewhat unorthodox sexual history. More specifically, I've only had sex with my aunt (she is actually my blood uncle's second wife--not blood related, plus she is pretty hot in my opinion).
She has taught me virtually everything I know except marturbation, and I've been having increasingly wild sex with her since we started when I was 16 (she was 37). I usually play submissive, and enjoy being ordered around or listening to hber threats of "exposing" my behavior to friends and family if I don't do whatever she wants me to do. This is all roleplaying and is really fun; a lot of times she is very loving to me and has been patient with my sexual inexperience.

NOW to the question: recently, I have been rimming her anus during the submissive roleplaying. The last couple of times, it has gotten extremely weird, as she has adopted a sort of perverted "loving" tone that is impossible to decipher because it sounds serius but is undeniably a little gross. For example, last time she started whaling stuff like "do you like the taste? I haven't wiped my ass all day just waiting for you to clean it." even though it didn't look or taste particularly dirty. Because of this, I played along and said "yes" to her question.
THEN after we were done having sex, she told me that her ultimate fantasy would be to see me eat her feces then lick her anus clean. I laughed but she din't seem to be joking. When I said goodbye, she looked me straight in the eye and told me that, on a future visit to her house ("not next time I swear") she will prepare for my arrival by taking a dump on a plate and putting it on the dining room table. She will sit at the other end of the table silently and I will be faced with the decision of whether to eat it or not. She told there will be no pressure, though it would be probably her "only chance" to fulfill her ultimate fantasy because my uncle (her husband) is supposedly too uptight about sex.
I'm not sure if this is normal, or if it is even healthy. I really like sucking her asshole but am not sure if eating feces is in the same league. Since my family is so conservative (i don't think my parents have EVER shared cum...I'm not even sure if my Mom knows how to gag!!) I think I have been brainwashed to think that feces is "gross" just like I was with peeing and anything anal-related. She insists that I should not follow the puritannical "values" pushed by my parents because we are living in "postmodern times" (she is really smart and a kind of "deep thinker"...sometimes I have trouble catching up with her advanced ideas about life, etc.)
Apparently, she also ate the feces of an older woman when she was about my age, and enjoyed it. She tells me that she would do it again, but only if it were another woman's feces, because apparently male feces are unhealthy due the way it passes thrugh the prostate. Anyway, I'm not sure what I should do. Am I being too uptight about sex? I wish my parents were normal!