SPONTANEOUS SEXUAL FUN, IDEAS?

So, this guy and i who ive been seeing the last few weeks are going to my friends birthday this weekend. We agreed that we would be fun and spontaneous with each other in a sexy sort of way. (We realised once we said it we may of ruined it but oh wells!). I was going to ask you guys for ideas!! Like, I was maybe thinking... When it's just me and Him.. where ever that may be ... getting him to close his eyes and grab his hands and run them up and down me and then start kissing him.