Isekai Gakuen de wa SEX ga Hisshuu Tanideshita

I wake up in the classroom... But wasn't I at the station? And the teacher is talking about sex as if it was nothing! Also, how does he know that I'm a virgin?! "If you're scared to do it for the first time, then you can do it with me?" All of a sudden, I felt my teacher's fingers slide into my clothes along with his damp, hot breathing. Is this how I'm going to have sex for the first time...!?