to old for fun? what should i do?

about 3 months ago. i got a student teacher (a rather attractive one) came in my math class, one day when i went after school my teacher was not their yet but she was so we started to talk. i made a few jokes about her partying and she was like.. you dont even kno with a smile.. when my teacher came in and stated to help me we kept giving each other looks and just smiling. when i went back the next day she was leaving but she told me that i should come see her dorm.. she said it in a way that it sounded like it was educational because i told her i was looking at the same college for next year, when i went it was a single and we ended up hanging out with some of her friends it was a pretty normal night other than being young and being with a student teacher. butt about 1:30am rolls around and although we had been drinking and smoking we were not to bad and i found myself in bed with her. i did not really realize what had happened until the next morning and i was going to leave quickly.. so it was not awkward, but when i was going to leave she woke up and started to kiss me, she asked me why i was leaving and we started to do it again.. sober. could i get in trouble for this? one of my good friends thats a girl told me i was gross for doing it. am i? whats wrong with it? btw she is 26 i am 17