My fiance and his youngest sister ...

My fiance has a sister (and other siblings younger than him but she is the youngest) who is about 12 years younger than him. He's 30 now and lives in a different country than her and the rest of his family. I've spoken to her a couple of times and he's even asked me to talk to her about some classes etc. He told me she is scared of him in the sense she wouldn't defy his decisions (he will pay for her college etc.)
The first time I called him on the phone, he said my voice sounds childishly cute ... like his sister's. I found it cute myself that he thought way. Then, when we were talking about our families, he told me she is very cute and garners a lot of male attention in her school. She had visited him once and he said he took her to an expensive hair stylist. He told me she looked "yum" in her new hairstyle and that guys were looking at her. They are close in the sense that he buys her whatever she wants and takes her out shopping etc. We often talk about having kids and how we want our kids to look. He says if we have a girl, he'd want her to look like me or his sister. All this has never ever bothered me until last evening ...
He's visiting his family. One day, he asked me what I was wearing and I replied "A pajama and t-shirt". He tells me his sister is wearing the same. I got a little confused as to why he had to say that.
Then, last evening, he tells me "Btw, she has a wonderfully toned *** and guys must be eyes it...i'm worried about her." I got psyched n told him it is weird that he said that about his sister. He told me he can since he is her brother. Then he got a little quiet. I asked him if he did not like what I said. He replied "Yes I did not. You made me sound like a pervert eying my own sister."
I apologized and he is normal now but is there a red flag here?

I doubt you have anything to worry about -- it sounds like he was just being honest about her. Yes, it does sound a little weird, but let's say that you were talking to his sister, and she said that her brother was really handsome. Would you think there was anything wrong with that? It's just guys say what comes to their heads -- and he thinks his sister is good looking, and he's worried alot of guys will be after her.

I don't think you have anything to worry about. But just in case, keep mindful of other things he says. God bless & take care. Hugs, Lee