"No, no! Stop it! It feels like you're going to insert it! Please, I'm really about to insert it, so please stop! We agreed to just rub against each other, right?" When I was having frottage with the excessively busty tutor, it got all slippery and then slipped in! It felt so good that we ended up having raw sex and a raw creampie, and I was writhing in ecstasy with continuous explosive orgasms!! Finally, I was like a crab...