When this woman entered this partnership, she was under the impression that the guy was on the right path to taking care of himself. Now he has a wonderful woman and he has stopped improving himself. It makes sense. A lot of people do it more when they are out of a relationship. He need re-encouragement.

To be honest, I would get them to lose weight again, before I started accommodating to the status quo too much. I would work out with them, change my diet with them, etc. It is super important to me to have a partner who takes pride in their appearance, and more importantly, their health. If I am entering a long term relationship with someone, they better take care of themselves, the thing that I am loving and putting my time into.

In the mean time...since it sounds like she still WANTS to have sex with him, I can only think of a few options since I don't know exactly how large he is. If oral is getting boring, perhaps she could have him pleasure himself while she does the same in front of him-like a show. If her breasts are large enough to work with his body, perhaps stimulating him between them would work as well.

And... since her on top is not working as is, I would try him leaning back so that he is more exposed. This might be able to be achieved by propping up his lower half. Also, IF he can get on top...it was not super clear from the "asker"... prop yourself up so that penetration is easy at a good angle.

Here is a link that might help her: link