There was a distinct significance to his relationship with Matteo, one that had almost been bred into the vampire from the days of his own youth. Marriages were, after all, only done with the acceptance of both families, quite near requiring the approval of the heads of both households, whenever possible. His first fiance's father had not particularly been overly fond of the boy, but he had accepted him, if only for the properness of his lingering presence within William's life. His wife's father had all but doted upon him, welcoming the vampire into their family with gusto. Matteo, however, was an entirely different situation altogether. The fae Frenchman had a way of eying Sebastian as if the very weight of that silver gaze could peel back his very soul. That eternally knowing look seemed to suggest he knew every minute secret the Englishman kept from his newly wedded husband. Those often veiled words he offered constantly left the vampire wondering just where he stood with the fae, prompting the stiff politeness he so often afforded his father-in-law on those rare occasions in which Dorian was absent. He was, in some terms, hardly unaware of that shift within himself. Sebastian was, after all, a multifaceted man with various demeanors to be called upon when the situation so demanded. What he was oblivious of, however, was the way in which Arlo had so picked up on that shift and how it too had set the Crusnik on edge.

The mention of a favor only furthered the vampire's weariness, the man assured that any sort of assistance Matteo might require of him would neither be easy nor a task he particularly enjoyed. Arlo's offer of money prompted his bright blue eyes to slide to his companion and yet, the vampire sincerely doubted his father-in-law had come for any sort of financial donation. He was unsurprised when such an offer was shot down, only for the Frenchman to inform them that it was venom that he was after. Sebastian's lips pressed together ever so slightly as he contemplated the dangers that could come from gifting his venom to another individual, much less how Matteo had known about the properties of his venom in the first place. A part of him drifted between smugness and cautiousness, the vampire entirely conflicted when it came to that request. It took him a moment before he realized the length of time that had passed before either of the pair of undead had spoken, his very upbringing near demanded his efforts to break that silence as he cleared his throat, inquiring for Matteo's intents for such a liquid. That soft sigh upon Matteo's lips hardly went unnoticed by the Englishman, much less the drum of the fae's fingers against the edge of the armchair. How he abhorred that sound of disappointment from the fae! His very nature so demanded he pleased the fae.

His eyebrows furrowed ever so slightly as Matteo assured him he merely intended to mix their venoms with the intention of assisting another. Truthfully, he saw little benefit that could be gained from the combination of his venom with Arlo's beyond furthering that relaxing sensation that their two venoms had in common, sort of. It baffled him as to the purpose of that little experiment and yet, he doubted Matteo was willing to expand upon that explanation any further. It was, however, the mention of getting that venom from an unwilling donor that made Sebastian even iller at ease and yet, he was hardly oblivious to the suggestion that there was someone else who might be coerced to provide the venom the two men held. Sebastian had, after all, never met another who held a chemical concoction exactly like his own. Matteo's shrug was hardly that informative before the Frenchman admitted that he knew of none whom could do exactly what the vampire himself was capable of, much less the mention of those very visions he had been accosted with, only confirming Sebastian's own suspicions that Matteo was...well informed of exactly the sort of things Sebastian so often did to Matteo's own son. Still, it was Matteo's assurance that there were more of Arlo's kind that intrigued the vampire, even if it hardly served to set either at ease.

Arlo's sudden insistence that such venom did not come easily, however, hardly bothered by what he clearly viewed as only a minute challenge. That small sound of Matteo's foot against the wooden case drew Sebastian's own gaze towards the object - the fae's preparedness for this only continued to stroke those misgivings he had of that favor. The very sort of wariness that Matteo had seemingly picked up on. His blue eyes fluttered upwards at the sound of his name in his father-in-law's French accent, that very mention of trust and belief that Matteo daily placed in him when it came to the greatest treasure either had - Dorian. The soft reminder cut through the uncertainty that had plagued him, prompting a sort of shame within the vampire as his gaze shifted towards the floor, altogether aware of what he surely owe Matteo. Was this not what his duty was after Matteo had welcomed him into his small family? He knew well he shouldn't have questioned the fae nearly as much as he had, it had been in poor taste. A soft breath left his lips as Arlo's inquiry hung in the air - the very answer to which everyone present seemed to understand. He could hear the Frenchman moving, the sound of the latches of the briefcase coming undone near seemed to echo in the quietness of the living room. Although Matteo had assured them that he had his own method of ensuring their venom flowed for his own needs, Sebastian suspected it was hardly as enjoyable as the vampire himself could make that retrieval. After all, he felt some measure of guilt at getting Arlo involved in the whole affair, the last he could do was ensure that the Crusnik took some enjoyment out of what was clearly a distasteful request.

Sebastian reached over, offering Arlo his arm with his palm turned upwards to reveal the thin skin of his wrist. His inquiry seemed to immediately reward him with the Crusnik's attention, prompting an almost predatory shift within Arlo, even if Sebastian had expected some sort of reply. His gaze turned upwards at his name upon Matteo's lips, that sudden, sharp command caught him entirely off guard and yet, even for all his own quick reflexes, the Englishman hardly had a moment to react before Arlo's hands enclosed tightly upon his wrist, plunging his fangs into his skin. That soft gasp left his lips at the pinch that came from Arlo's fangs, only for that blissful sensation to flood his system with such rapidness, prompting a soft dreamy sigh as his very thoughts became clouded with those euphoric feelings. He was wholly inattentive to Matteo's sudden presence at his side, with the exception of that utterly delectable scent that accompanied the man. His voice was hardly above a whisper as he repeated those words, "....quite....enough..." And yet, Sebastian made little effort to pull his arm away from his companion even despite the peculiar sensations that so accosted him at his blood being stolen from him. That once bright blue color to his irises quickly darkening as he merely coped with all those feelings that flooded him.

He watched as Matteo reached out to entangle his hand in Arlo's hair, only to pull the Crusnik's head back and his teeth free of Sebastian's wrist. His blue eyes watched as Matteo shoved the container to Arlo's teeth, that clear colored venom flowing readily into the container. How curious, it was, that the very substance flowed through his own veins now. Sebastian provided that whole processes with a blank stare, contemplating whether or not his own venom was clear an, in turn, if he was somehow made of clearness altogether before Matteo's voice broke through that internal quandary. "....Oh." He uttered, that response decidedly delayed, the vampire only just discovering how his tongue seemed to tingle as it brushed against his teeth in his mouth. How.....peculiar. He watched as Matteo finally released his friend, that cursing and spatting prompted an almost amused grin upon his features before the vampire abruptly decided that his legs felt like jelly. Maybe he was made of jelly and that was why is venom was clear? Maybe Arlo was made of jelly too. He eyed the younger man almost suspiciously as he reached out for the back of one of those armchairs, leaning heavily upon the furniture. It was a good chair.

His hand reached up to gingerly brush against the fabric of the chair as if petting it for its goodness. "Hm?" He inquired almost lazily, his gaze turned upwards towards the fae as a container was given to him. Venom? What venom? Was he a snake now? His hand reached out, to pluck that vial from Matteo's hand, only to study it intently. Did Matteo just give him a gift? He maneuvered carefully around the chair, only to flop into its comfortable embrace, one leg settled over the arm of it while his head leaned against the other arm. It took a measure of intense thought as his fingers slowly unscrewed the lid of the container, only to eye the now two pieces he held in his fingers. The very goal of that container, it seemed had been wholly forgotten somewhere amongst all the venom that filled his blood and punctured his thoughts. It was, Matteo's accent that drew his gaze upwards from his achievement, those very words prompted a soft sigh from the vampire, only for a more boyish pout to cross his features. "I...is not...difficult. You're difficult. Why are you always so....so.....difficult?" Sebastian's inquired, almost frustrated with his father-in-law before a rather ingenious idea came to him. His finger fit into that container, wearing the vial quite like a hat before he twisted in his seat to present his finger to Arlo. "Arlo, don't be difficult." The vampire commented, mimicking Matteo whilst his finger wiggled as if it was the one saying it instead of him. It was, by far, the most humorous thing he was sure he'd done all day, the vampire apparently of a one-track mind at the moment - none of which included his own venom.