A guy on this site once convinced me to come to his house when his wife was drinking and come on to her. It worked perfectly she was so willing and it was easy once she knew he was good with it.
Start off slow and enjoy him at your speed. You will likely be then wanting more, and you can slowly get more agressive to the extent you’re comfortable. Chances are you will love it and get hooked.
The beauty of it is that she is in control of the situation and if she’s not feeling it she doesn’t do it. There will be plenty more opportunities with that body and that attitude no problem there!