If you think your little student that is just learning how to blowjob, is trying to impress you with his fake titties, then you are in for a surprise. He is not trying to seduce you or even think of getting with you, he just got the hots for you from seeing you earlier that day blowing you in the hallway. The only reason he is blowing you is because your sweater is so revealing and he was attracted to it. So the answer to your question is no, I've seen you look at my titties, you're not trying to impress me. You are trying to get into my mind, so you can please me.