bondage/bdsm

Okay so I want to try bondage/bdsm 
(Note: I Lost my virginity to my S/O about 5 months ago) and I don't know how to bring it up to him even though we are so very open with each other about everything I still don't know how to bring it up to him plus I feel like it would be hard to do as we both still live at home (he's 22 and I'm 19 because anyone questions it) 
So yep just need some suggestions ladies!