Dampyr #172 (2014) pages 61-62: That ain't love.

Sergio presents himself before Olimpia the vampire:

“You’re here, finally. I’ve been waiting.”

“Aren’t you resting?”

“I don’t sleep now. I can’t sleep.”

“How did you decide to deal with Mario Leone?”

“Mario Leone does not exist.”

“What do you mean?”

“I took care of him personally. Look!” (Mario’s head)

“Ah!”

“What's the matter? Sick to your stomach?”

“Why! Why did you do it?”

“You must be able to look horror in the face, or I could never trust you again.”

“Of course you can trust me. What are you thinking?”

“You tell me. You have that woman's perfume on you.”

“She's my wife!”

“You obviously continue to have relations with her.”

“But I love you, Olimpia!”

“Prove it to me, then!”

Olimpia shows her weakness: Despite being an ancient vampire, she's besotted with her young assistant, and jealous of his wife. Look out, wife!