Is it normal to tell a chubby girl her thong is showing?

In 7th grade I had a friend named Miranda who would wear thongs in school, one time she showed me her thong after school behind a dumpster and pulled her pants down her butt was big and I got horny seeing her ass in a thong, she then pulled her thong below her ass and showed me her naked butt I asked her if I could touch it and she said yes, so I touched her buttcheeks and her buttcrack then she told me to smell my fingers and tell her what they smelled like, I smelled my fingers and they smelled like ass, I said "like ass" she said "does my ass smell good" I said "no but the smell of it makes me horny, she then put her butt all over my face until my nose was up on her butthole I will never forget that day