The teacher is pretty advanced - letting students fuck in front of her and giving her advice is cool. Sure, the student was a little shy at first, but that passed quickly. I, too, think we need hands-on sex lessons, then it will be proper and safe. And still the guy cum on the boobs of the teacher - after all, the students have to somehow thank her for teaching them.
The lady is of course old and fat, her tits are saggy too. But for all that, I would have loved to spend time with her, she was still very attractive. Personally, I wouldn't go down on her tits. It's much nicer to fuck her in the mouth a little at the end and cum in the same. It's especially nice when a woman works you with her lips for a few more minutes after you cum. The pleasure just makes your eyes pop out!