Tails!

"I'm sorry," said Sally. "But I just can't chance it. I wouldn't know what to do if I got
pregnant." She looked at you apologetically, and began to stroke your cock in turn.
"Don't you have a condom?"

...

When it's found out that you don't have a condom of any sort, the two twins quickly
lose interest and ask to be driven back home. Although they thank you for a nice
night, you realize that your night won't be ending any bit nicer for yourself.

Deciding that there was no point to going home, you simply drove around the city
for one last stroll. Finally, as your time came up, you suffered a cardiac arrest
and died swiftly within your car.

Having not fucked anyone, and not spread your seed, you did not produce any
children. As a result, your legacy ends here.