Several things, not sure what is hot or hottest having very slow penetration with my fwb, she never wanted it fast after
I don't know if I can give the hottest, so here are several. A BJ on a public bus. Though there was no one sitting next to us, there were others on the bus. My wife use to have me invite friends over, she would pretend she didn't know they were there and would walk naked from the bathroom to bedroom past an open door. Watched my wife give a buddy a BJ. Went to an adult halloween party in a place that had a couple thousand people, and had sex up in the bleachers but a few people came to watch. Went to a fancy restaurant, had my wife go to the bathroom, take offer her panties, and come back to the table and play with herself until she orgasmed. MFM both drilling every hole, ending with two shots of cum on her face, while my buddies wife watch it happen.
All this week i have been busy at work, getting up early and going to bed early. My girlfriend and I are normally intimate quite a few times a week, but this week has been so busy we haven't done anything since last weekend. We both were looking forward to getting home from work on Friday and getting it on. When I arrived home on Friday, my girlfriend was having her hair done in our kitchen. I was so horny i couldn't think about anything else. I said hello and said i was going for a wash, which I did. Once i had a wash i got my 8” suction cup dildo out. I hadn't had any anal action for a while either, and so I prepared my asshole. I slid myself up and down on that silky length and it felt lovely as i had missed it. Soon enough my girlfriend had finished her hair and it was just us. She saw me getting it on with my silicon friend against the wall, and she got on her knees and started sucking my cock while i had a full asshole. I moved my hips back and forth and as the dildo moved in and out, my throbbing cock was moving in and out of her moist, warm mouth. It was the best feeling ever. So intense. It was like a race between making me cum from my ass or my cock. One of the best sexual experiences ever. I came so much and so hard she had a good handfull of it. Afterwards i was weak at the knees, cant wait for next time.