Young lady over there, pardon me for being blunt.
The point I want u to understand is.... No matter how strong ur
relation / bond with ur present bf is, it doesn't means that he'll
be ur husband in future.
Yet u want to try ways and means to satisfy him, it'll not get u to
anywhere.
But if u both wanna try the "forbidden fruit", be mature enuff to
think of the consequences. There's no other alternative for u, like
wat u said... u wanna make him "high" yet u wanna have a fool-proof
method. I dun think there is...