Is it normal to like the smell of asshole

My friend's little brother is 11 my friend doesn't know that I show her little brother my butt when she's not around. The other day I was at her house staying a night and she went to sleep and her little brother was looking at my butt and he was grabbing his dick and he asked if I can let him see my butt and we went to the room and turned on the small lamp and I took my shorts and panties down and he saw my naked butt and he was horny and he smelled my butt and he said "I love your stinky booty" my butt smells like sweaty butt always and then I spread my butt open with my hands and he saw my butthole and he loved it he always wanted to see my butt and when he finally saw it he was so horny he smelled it it and jerked off he looked at my butt for a long time while I looked at tv and he kept spreading it open with his hands to see my butthole he really loved it I liked that he is younger and him liking the smelly part of my body he loves my bootyhole