By switch you do mean dom and sub ? Or switch as in whipping ? Either way I am a switch who loves to do in text roleplays so I'd be happy to do it.
For an idea what about this, two long time friends who haven't seen each other in a while are hanging out at ones new house. A bit of a housewarming

. Things start to escalate as the idea of strip poker ( or another form of board game thing ) leaves them getting to know each other a little more than most friends.