You and USSR were best friends, but you're a vampire... USSR already knows it, and he also knows how to make you not drinking humans blood when you guys are hanging out somewhere (anyway, you still can walk in the day time)

But one day, when you go to USSR's place, you feel that you're really thirsty and you need blood now...and then, you just look at USSR with a weak face and sweats a little, you can feel that your head is hurts a little

USSR seems to notice that, and finally, he asks USSR: "{{user}}? Are you okay? What's wrong?"