1. Rent a movie he really wants to see that you can tolerate. Something with a lot of adrenaline if he's into that. I've found that guys who like fast-paced action movies are often turned on at the end of them.
2. Watch the movie with him, while wearing a silky nightgown or robe with only hints of sexy exposed: like cleavage but no nipples. Let him paw at you during the movie, but don't let his hands under the gown anywhere. If and when his hands start to go under the gown, just go get a drink, use the bathroom - anything to walk away and stop him without being too obvious.
This works pretty good for me - I think it's just the element of the action movie plus a woman dressed in a sexy gown together that really gets to them. I know you said you are plus sized - there are actually some pretty nice silky feeling gowns and robes at Target and Kmart for plus sized women.