Eva is "Beatrice." (Pink Trigger)

"Aha..." Battler whipped the blindfold off his head, shutting his eyes and still panting with exertion and satisfaction. "I can't believe it, but you are a witch. You've gotta be, Aunt Eva."

"You... D-don't call me that!" his decidedly human partner growled back at him, although "righteous indignation" didn't quite seem to be the right words for the look in her eyes. "You're supposed to call me Beatrice... I'm supposed to... be a witch..."

"Haha, okay, yeah, sure! Beatrice," Battler chuckled, giving Eva a rude slap on the ass that made her body jiggle... but which she didn't seem to object to as much as I'd expected. "Oh man... I fucked Granddad's witch... and the old bastard's sister... all at once... w-what am I gonna do...? You really screwed it up this time, Battler...!"

"Battler..." Eva slid back onto his lap, though re-positioned off of his now-spent member. "I'll... give you that last stack back, okay? And in return... You can never tell anyone about this. Nobody. I... still love Hideyoshi! It really was just someone else, a witch... th-that made that yell, just now..."

Even now, Battler had a surprisingly cavalier look to his grin, but I thought he was thinking about what she said seriously. "No, actually... Aunt Eva, you keep the money. You're the one who deserves it, anyway. But, in return... I want to see that witch again."

"Again...?! Battler! I... can't possibly..." Eva moaned, covering her lewd lower body with her hands.

"No, not right now, obviously. I mean, when that witch and I have a chance to see each other again, maybe we'll make a little of that magic, you know? Ihihi... Or, maybe, if I see that witch roaming the mansion like I hear she's prone to do, and nobody's around... I'll use my hands to show her my faith like I did earlier, okaaay?" The incorrigible young man played with the breast of the woman still sitting in his lap, using his other hand to stroke her thigh.

"Only... when nobody is around, obviously... If anyone finds out, I'll... g-give up and die. But not before I kill you first, Battler..."

The two made out as if locking their lips sealed a contract. What a crazy ending to a crazy story... I feel like this is a weird pairing, even for the infamous shippers among Witch Hunters... But what love has joined, let no one tear asunder, I say. Especially not because it's almost midnight, and none of this will matter in a few short minutes, anyhow.

Besides, it's not as weird as Battler and-"Asmodeus!"

Huh? Yeah, that'd be- Oh. Obviously, that hadn't been me. Someone else's voice had yelled through the door. Battler and Eva probably thought someone had overheard them and were frozen in shock... I knew it was even worse off than that, since I had a pretty good guess who that hoarse roar belonged to, so I was in no position to dodge the ceremonial stake that somehow shot through the door. As though propelled by incredible ****, it didn't stick in me so much as through me.

I heard a furious voice shout in my final moments. "Take all three of them, Asmodeus! These filthy, wretched humans are not fit for my ritual and will never join me in my Golden Land! Let all three of them become offerings to lust!!"

... Fair enough... The witch seems awfully impatient this time, though...