Best ways to tease him?

Me and my boyf did something a little different last night- he tied me to the bed by my hands and blindfolded me and we did a bunch of stuff. I later blindfolded him (he didn't really want his hands tied, but he said he'd keep them up by the bed head- which he kind of failed at by the time I was giving him head ;) ) but, despite following what his breathing was like, I feel like I could have done more- how do you tease your SO? Give me ideas, we're definitely going to be doing more of this ;) ;) ;)