so one of those with a skinny bottom basicly to the "bottlenecking" plug and i have already tried the thong panties first idea i got

i have a problem with my but plug it doesn't really stay in when im moving around or standing up but fits pretty nice and can put it all the way in if i stay laying down it doesn't come out so i want to try and keep it in for longer pirod of time but don't want to just lay in bed to keep the thing in