When it comes to discreteness and versatility, your options for sex furniture and play toys are more varied than ever. Here are a few suggestions that may fit your needs:
There are many furniture makers that specialize in dual purpose furniture that can convert to be sex furniture during "playtime." Try an Etsy search for convertible BDSM furniture.
Try incorporating small decorative storage trunks that fit under your bed, double as foot stools or match your decor to store play toys.
Commit to clearing out one dresser or nightstand drawer to hide your favorite toys in.
Hope this helps.