Speed changes really heightened the mood. Just sliding on top as fast as possible isn't sensual but slow, agonizingly slowly sliding, is amazing.
Consider laying on top for a few moments and matching breathing patterns, that can heighten the connection.
Feel free to reach underneath the guy and slide your hands along the wedding tackle. Yes, it'll be difficult to do, but feels unworldly good.
Personal preference is gel over oil, but I also don't like oil in a regular massage.
Mirrors are great, wish there was one overhead.
I like the floor (gym mat) over an air mattress, and both of those beat a bed, at least for me.
Figure out how you're going to clean up BEFORE getting all messy! Realizing there's only one towel when both are exiting the shower is disappointing.
If you're going to microwave the gel/oil then set a little aside for tempering in case it gets too hot. Having too much lube is better than not having enough!