I'll put a lemon warning so you can skip it if you want when it comes up.

If it was up to me we would've arrived at 11:20 am because our flight was at 12:30. But nooooooooo, we had to be here at 9:16 in the morning. Elaine's flight didn't take off for a while too and I low key wanted to go sit with her but I had already said my goodbyes and I couldn't bear to do a second round of goodbyes. Plus Hisoka and I were hanging out. I had my head on his shoulder and I had my eyes closed because I was tired. "Y/n am I thiccc?" Hisoka asked me jovially. I opened my eyes and sat up. I stood up and squinted and pretended to inspect him closely. I flopped down on his lap and said, " yes my good sir, I pronounce you thicccc af with a snatched waist". I laughed at my own joke. " oh Love, you cant say such things to me, my ego will get too big." I just blew a raspberry into his neck and he grabbed my thighs and hoisted me up so I was straddling him. This reminded me of when we used to play fight when we were younger. I started to laugh, remembering our tickle fights but then he grabbed my ass and pulled me down onto his lap so my crotch was on his. I rolled my eyes, knowing he was acting like this because wanted to end the tickle fight before it started by acting like a total weirdo. Well sorry, bukaroo, that's not going to happen.

Hisoka's POV
I looked at her face, her bright happy face. Then with my hands already on her backside, I squeezed. She yelped in surprise. I squeezed again, slower this time and I moved my hands moving up and up almost reaching her breasts when she began to tickle me in between my neck and collar bone. My weak spot. She yelled " a new tactic, eh? Trying to distract me are you? Well, Mr. Morrow you'll have to try harder than that!!!" She only stopped assaulting me with tickles after I let her go. Her face was blushing but not from embarrassment, but from the physical exertion of winning a tickle fight. I couldn't help but want to see her blush because of me. I knew I wanted to wait but I also knew I probably wouldn't be able to restrain myself for long, since I had been waiting a whole year already (it started when she turned 17). She grinned and winked, knowing she won that round. I sighed and offered to go get some smoothies, after she said she was hungry.
Your POV
When Hisoka returned with the smoothies you were already drooling, admiring a tall, pale man with luscious long hair, and and impeccable arms. His big eyes were staring at his phone and you shivered at the feeling of his aura. It seemed like he had Zetsu on but you could still tell this guy way on another level of powerful by his smell, like Hisoka. You weren't far behind in terms of strength but they both had more experience and training than you did. Hisoka sat down and noticed who I was staring at. Hisoka said, "oh by the way Love, that's my friend Illumi Zoldyck". He smiled "we're engaged" he added sweetly, looking at me to gage my reaction. "WHAT!!!! You're gay?" I screamed loudly (on purpose). Some people turned to look and Hisoka gave them a death glare and turned it to me. I didn't back down, I've seen that face so many times on him it no longer sacred me. "Don't take things so literally, y/n" Hisoka said annoyed. " I mean he and I are engaged in a type of contract to do work with each other once we are certified hunters". My face fell. He was leaving me too? Hisoka seems to read my face and said "oh no Love, I forgot to mention you are also written into the contract as my partner." He winked. I breathed a sigh of relief " thanks Hisoka, I don't know what I'd do without you" I said. Hisoka and I just hugged each other for a bit then he called Illumi over. Illumi looked annoyed, but strolled over anyway. "What" Illumi said. You heard that voice and couldn't help but simp just a little bit for this mysterious stranger. Your body language changed unconsciously before you knew it and you leaned forward more and pinned your arms to make your breasts look bigger from his angle. After all, you had many, many crushes but between Hisoka and Elaine you never dated or went out with anyone. You introduced yourself and went babbling on about the Zoldycks and how it was "such an honor to meet you Illumi" and you suggested that Illumi "meet me- uh I mean usssss for lunch later" but before you could go on, Hisoka held up his hand silently signaling you to stop. Hisoka looked pissed. You shut your mouth immediately and once again unconsciously angled your body toward Hisoka, showing him you listened to him and that you recognized him as the person in charge- not Illumi. At these subtle movements Illumi's small frown he already wore deepened, and Hisoka pulled a retrained smile. Hisoka said something about the meeting place for the Exam and something about walkie-talkies, then Illumi nodded and walked away. You immediately apologized to Hisoka for being unprofessional. Hisoka just pulled you onto his lap again and told you it was ok. Still, you felt bad and told Hisoka how you kind of had a crush on Illumi. Hisoka frowned and said "yes Love, I guessed as much. But two things- remember our promise all those years ago? You don't leave me" he said. And I nodded, I understood that he had abandonment issues so I just kissed his cheek gently. "What's the second thing?" I asked Hisoka, bringing him back from being a tad spaced out after the kiss. "Oh yes," he said- " he got his mouth close to my ear and I shook with anticipation at being able to hear a secret (UwU). Hisoka whispered, loud enough for Illumi to hear him " and I think it's a fair to say that Illumi probably has several STDs." You laughed and then you remembered that that's an inappropriate thing to joke about. " Hisoka" you scolded him, " that's not very nice". With Hisoka's hot breath still in your ear he whispered " Love, when have I ever been nice" you didn't know why, but you felt your heart rate accelerate and you got pleasant shivers down your spine.

Lemon warning

You moaned quietly on accident. You were embarrassed but Hisoka only smiled at that and at that he licked your ear and you moaned again quietly. These feelings were foreign to you, but boy did you like them. He sneakily began to move his long, cold fingers up your shirt, knowing you didn't have a bra on, and at that moment he smiled and grabbed your breast and began to massage it slowly. You felt your face heating up and the space in between your legs growing hotter. This felt really wrong but at the same time you realized it's something you've wanted from Hisoka for a few years now but never really realized or admitted it to yourself. "I- uhhhhhh, Hisoka, we are in public, I, ahhhhh". Is all you could manage to say. Your face began to heat up as Hisoka reached his lips down and bit your bottom lip. You realized you wanted to kiss him so you moved you face up a little and his soft lips gently fit onto yours. His other hand squeezed you ass again and you moaned and he used that as his chance to slide his tongue into your mouth. His saliva tasted sweet, like the way he smelled. He pulled away and whispered " mmmmm you taste so very good Love". At this you moved from sitting on his lap to straddling him again and you ground your hips against his and your breasts were pressed up against his chest and your you begged him" ah Hisoka please". You both knew what you were asking for but unfortunately, you were after all in a public airport.

Lemon over

Then some random college frat boy yelled " ay you two!! Get a fucking room. Shit my eyes!" Some people around him nodded in agreement and I realized how many people saw us. I immediately got snapped out of it and moved off Hisoka. Hisoka was about to do something, I could feel his bloodlust leaking out and I just said to him " it's ok heh", you took his hand and looked into his eyes questioning, like dude, what just happened. You said awkwardly " so are we friends with benefits now or heh..." Hisoka turned to me and opened his mouth to say something but then Illumi, having witnessed the whole display chose his time to walk over and strike up a conversation with Hisoka about the contract. You, feeling really embarrassed and out of place announced that you wanted a veggie burger and you grabbed your bag and bolted.

Hisoka POV
She doesn't even like veggie burgers, I thought. Then I let all of my bloodlust out directed toward Illumi. It seemed he knew what he was doing but still wore his emotionless mask of a face, but with only a tiny smile. Anyone would've missed it, but I saw it. He did it on purpose and he was smiling. I knew how awkward y/n could be and I had to address my actions and explain them to her fast. I had restraint problems to say the least. Initially, I'd had a whole plan laid out, we'd go murder some hardcore criminals (Love doesn't like murdering  innocents, or petty thieves, how cute). Then, we'd share a strawberry ice cream cone and I'd remind her of how she defended me all those years ago and how we were meant to be friends then, but were meant to be so much more now. Illumi broke into a maniacal grin at watching all these emotions flit across my face. I sighed and tried to play it off, to salvage the situation before we have an all-out brawl " ah, well." I said. " she'll be back soon and she'll keep coming back to me. Always. And I'll keep coming back to her." I said looking Illumi in the eyes. Illumi just shrugged and said quietly " ah, I'll have to inform Machi then". I flinched at the mention of the name. I liked Machi. I still do, but I don't love her like I love y/n. Still, this is a delicate situation with y/n and having Machi's bisexual ass running around won't help things one bit. I looked up at Illumi and said " Machi does as she pleases, you know that well enough, don't you Illu-?" I stressed that nickname because once upon a time Machi and Illumi were engaged, that is until I showed up. I'm such a home-wrecker UwU. I suspect a Illumi was trying to exact revenge but I will gladly tie his hair into braids, cut it all off  and and shove it down his throat to protect my favorite conjurer. Illumi sensed as much and retreated back to his seat to brood.
Slight time skip
It was a few minutes until we boarded the plane and I text y/n to tell her as much. I got those little typie dots that show up when the other person is writing a text. They kept disappearing and reappearing and that when I sighed aloud and called her. She answered and I said " Love, we have much to talk about on our plane ride, let's NOT miss our flight hmmmmm". She responded with "sorry, got another smoothie to calm my nerves. I'm walking there now." I rolled my eyes, knowing full well her walk was akin to a slow, leisurely stroll. "Please run y/n." I said. "What! she screamed into the phone, we still have *pause* two minutes left". I was tired of this and just wanted her here so I said I  to the phone again "RUN". And I hung up. A few seconds later she jogged up beside me and hugged me. She began apologizing and saying that we could still be best friends if- I didn't let her finish. I held up,my hand and I said seriously, "I will explain on the flight, don't apologize Love." She smiled weakly and we eventually boarded the plane and sat in our seats and stretched out our legs *first class baby* . Y/n took my hand and I opened my mouth to explain myself and then...

Cliffhanger lol