This happened over 30 years ago
Back in the early 70's I had a very sexy English teacher who was in her early 40's. She was blonde around 5'6' with very large breasts. All the guys thought she was the coolest teacher in the school.
One day I had to stay after school to work on a project and I stopped by her classroom to chat while she was grading papers. She mentioned that her car wasn't running very well and since I was pretty good tinkering with engines could I take a look at it. We agreed to meet Saturday morning at her apartment complex. Saturday I arrived at her place early and she met me at the door and gave me the car keys and I got to work. It was a pretty easy fix, just a clogged fuel filter and I had it changed fairly quickly. When I went back in she had just gotten out of the shower and was in her bathrobe. She told me to go get cleaned up so I went in to wash up.
I noticed her panties and bra in a pile by the tub and being a typical horny 18-year-old couldn't resist inspecting them. I found out she was a 38D. I quickly got hard and began jacking off. I guess I was taking a long time cause she came to the door and asked if everthing was ok. I quickly zipped up still rock hard and came out of the bathroom. She noticed my hard cock and asked if I had a problem down there! She said if you don't tell anyone she would help me with it.
I promised to keep our secret and she knelt in front of me and unzipped my pants and took out my hard cock and began stroking. As she did I reached down and ran my hand down her robe and began feeling her big tits. It didn't take me long till I shot a large load of cum all over her hand. Some even hit her in the face. That was the start of several sessions at the teachers apartment. I'll never forget her as she taught me more than just English.