I'd done such a poor job of hiding most of my improvement, that hiding the rest of it was pointless. I was happy to stop being cautious, as I didn't l...ke pretending to be dumb and I particularly disliked giving deliberately incorrect answers in tests. So it didn't take long for my teachers and classmates to notice that I was doing VERY well.My Math teacher, Mr. Barrett, held me back after class one day, "Mark, I've noticed that you are understanding the course material very easily, and that the. Tim moaned softly and said you've learned a lot in a short time. Releasing his dick I said I have good teachers. He laughed and said Bill will be happy. I went back to sucking his dick, running my tongue around the head like he showed me.After a couple of minutes I felt his warm breath on my butt. I shifted my legs so my butt was pushed out and my cheeks gapped. Tim ran his hands over my butt and asked is this what you want, then felt his tongue slide up my crack. I bobbed my head on his dick. After lots of hesitation he admitted that watching ladies smoking got him excited. I said, 'Do you get a hard on?’ He blushed even more and nodded.I said, 'show me' and took a deep inhale of the ciggie. I looked down and could see the bulge in his trousers.I finished my cigarette and by then it was time to go home. As I drove home I kept thinking about what Marc had said and by the time I got home I was feeling very horny thinking about how I was turning on this 18 year old boy. I knew that. Sperm started squirting everywhere again including on my face. I don't know why, but I wanted him to finish in my mouth. I took his cock back in and felt the last spasms of cum in my throat.============= We both had dates that night and I gave Mark the same favor. Boy was he surprised. He gave me the pleasure of his finger and we both got totally naked for the first time, but he wouldn't lick my pussy. I went home pleased but feeling a little cheated and went to bed. Paul came back a half hour.