Rufo said: One would think trying to force your penis into a vampires mouth would be a terrible idea.
Then again, drinking blood from one's cock is quite advisable, more so when it's erect since it's practically a blood-filled pneumatic cavity. The problem is how to stop the blood after you're done, but if you intend to kill the prey afterwards it won't matter. Well, there's also that concern about STDs, but if you don't break the blood-duct barrier (i.e. bite the balls) you'll mostly be safe.
KazuyaRazuKazama said: ^Touhou on Danbooru: Cause even on pics showing a loli vampire girl having a giant cock shoved in her mouth, you can STILL learn something.