Most Helpful Guy
Dunno.. how fat are you? If its just a few kilos, you can do whatever you want. But if you two look like this
I wouldn't try sex at all.0
Most Helpful Girl
Well, missionary might be complicated for you. If he's heavy, his arms might not support his weight for a long time or it could hurt his back. The ideal positions is the spoon. You can still manage to look at each other, it can be really sensual and it's the simplest positions.
You can also try a position the scissors sex positions. Google it. It's also good because you can easily move. It's almost better for a first time because you'll see each other. You can also try the cow girl which is pretty simple1