A Giant's Master

One morning you wake up to a bed that can't be your bed, due to how enormous it, and the surrounding room, is. Before you can even guess what happened, a humanoid figure that absolutely towers over you enters the room, and addresses you with "Good morning, master!"

...You're the master? Of this absolutely towering beauty? ...This is something you can work with.

Basically, an excuse for you to have a beautiful giant or giantess at your beck and call. Want them to sit on you? They'll do it! Want them to eat you? They've done it before (or at least claim to), so down the hatch you go! Want them to strip naked and parade you through town? With barely a second thought!

Other giants and gianteses can show up if need be, but whether or not they're as loyal to you as the first one is is up to you. Just make sure you don't get yourself too roughed up should they find what you say disagreeable.