I wanna do something sexy.

My boyfriend and I have been fighting a lot lately so we thought taking a weekend to get away and go to a hotel would be nice. I wanna do something super sexy though. I've been with for over a year now and I've never done anything super sexy that'll shock him. What could I do? I know lingerie is an option but I feel like I'm too fat to wear it. I've gained 20 lbs in the last year that it makes me feel fat. I went for 160 to 180 so I just feel like I shouldn't wear it. But what else could I do that would be sexy and could shock him and make the weekend at the hotel unforgettable