Nation A teases Nation B until they are a sobbing, shaking wreak desperate to come. And then, at least once, tells them "no." Whether this is with ice-play or cages or straight-up obedience training or something else entirely, OP is not particular. Yaoi, yuri, and het are all fine, and pairings are filler's choice, although OP is fond of sub!Germany. Also, if it's a choice between USUK and anything else, well...there is a LOT of USUK already out there, though I do like them...
Bonus 1: If you do go the long term route with a male sub, OP would LOVE to see some prostate milking.
Bonus 2: Once the sub is allowed to come, the top makes them come again and again until they think they can't anymore. Begging to be put back into the chastity device (if using one) will make OP's panties explode.
Any/Any, Orgasm Denial or Long-term Chastity
Also, if it's a choice between USUK and anything else, well...there is a LOT of USUK already out there, though I do like them...Bonus 1: If you do go the long term route with a male sub, OP would LOVE to see some prostate milking.
Bonus 2: Once the sub is allowed to come, the top makes them come again and again until they think they can't anymore. Begging to be put back into the chastity device (if using one) will make OP's panties explode.