So when I was about 16 I had a therapist who I found rather attractive and I made it obvious. One time I wore a short skirt and had no panties on. When he noticed he got super hard and I teased him. Then when I got up to leave I fell onto his lap and decided in that moment I would have sex with him. I got on my knees, took off my top and looked up at him. He said "holy fuck your tits are huge" so I shot back "I bet your cock is too, why don't you pull it out and let me tell."
After 2 hours my pussy and mouth were full of cum and I walked out of his office with his juices running down my leg. This carried on until last month because he got transferred.