Well you'd end up in a sexual scenario obviously. Lets find out what one.
First, what are you the last of?
1. The last of your sex. The battle of the sexes had to end one way or the other. And you are the lone remnant of your side. Maybe it was a virus, radiation from space or a purposeful purge, but you're the only one with your genitals left.
2. The last of your species. Your mother? Dead. Your father? Dead. Your siblings? Dead. Everyone who shares your genetics right back to the last time the evolutionary tree branched? Dead. Except for you. Welcome to the 'good as extinct' species list, buddy. Don't matter if you're a human, vampire, unicorn or panda, you're all there is.
3. The last of your organisation. If it was the noble empire that ruled the world, the brightest band of stars of the musical world, practiser of a now lost art or the criminal association that terrorised the innocent, they're all gone but you. By assassination or accident, you're the only one carrying the (literal or metaphorical) mark identifying you as the last of the world famous group.
4. The last of your home. Remember that sleepy old home town of yours? In that lovely home country? Possibly on your beloved home planet? Well, you're the only one that does. If it was war, an accident or just the passage of time, you're a refugee who can never go home.
5. The last of your lineage. Congrats. You're so orphaned you don't have a trace of any family anywhere. Unfortunately, it turns out that your bloodline is kind of important. Maybe you're royalty or the heir to an enormous fortune, maybe your family has been prophesied to overthrow the Dark Lord. Whatever floats your boat.
6. The last...whatever. Sorry, didn't catch that. You're the last whatever you want to be.
Oh, so you're the last [X]? That sucks. So what's happening now?
1. In hiding. There's a reason you're the last, after all. Something nasty went down and you're hiding from the consequences. Sadly, the time has come for your secret to be revealed. If you're confiding in a trusted friend or you slipped up and are being blackmailed, you two now share a secret that links you together.
2. Milking it for all it's worth! Yeah it's sad and lonely and all that, but it's also a way to cash in. You control the only supply of whatever you are and demand is high, baby. You're famous and loving it. And look at all those groupies you've got without competition getting int the way...
3. Not quite the last. You've been alone for a long time now, without anyone who can really understand what it's like to be you. Good news! You're not as alone as you thought. Turns out there's another last [X] out there. Through fortune or active searching it's time for you to meet and emotions are guaranteed to run high.
4. Rebuilding. Just because you're the only one around doesn't mean you have to be the last. Could be that you're spending your days in a laboratory under going attempts to artificially increase your numbers...if you want to or not. Even if they can't biologically help, a certain doctor might have been a shoulder to cry on too. Could be that you're looking for that first apprentice you'll use to recreate your once proud group. Or you're just trying to spread your genes the old fashioned way, all day every day.
5. Getting even. Your [X] is dead...murdered... And someone's responsible! You've dedicated your life to justice or revenge. But once you've got them in your sights, something happens. Maybe killing them isn't enough and you need to humiliate them first. Perhaps dedicating your life to someone has created some odd feelings that have mixed with the feelings of the sex drive you suppressed getting this far. Or even worse, they've turned the tables and you're the one who is on the receiving end. They could always be feeling guilty and you could forgive them too...
6. Something else. You're probably more creative than me. Come up with something cool, why don't you.
1) Post your characters, their canon and your preferences. Make sure to note if there are scenarios you aren't into, some of these could involve non-con, dub-con, incest, pregnancy etc.
2) Either roll up two numbers or pick a pair that you like, reply to other comments. Alternatively use your own comment to provide any number of short introductions to scenes you would like to play.