A/n- this oneshot is from the speech prompt "you used HALF THE BOTTLE?!" from my speech prompts chapter 😉 hope you enjoy.
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Mycroft -

It was the start of Mycroft's annual 2 week, non-negotiable vacation. All this meant was that, of some catastrophic event were to happen during this period, Mycroft would be bypassed and his second in commad would handle the issue instead. You spent every day of the year looking forward to this fortnight alone with your boyfriend...

At about 5:00, Mycroft got back from work with a relaxed grin on his face. The pale evening light seeped in through the window and bathed the room, making it just bright enough to excuse the ceiling light being off still.
"Ready to start your two weeks off Myc?" You grinned, hugging him as he shrugged off his coat (a task made difficult by the enthusiastic girlfriend clinging to his waist). In that moment, you were engulfed by an intense happiness, realizing that you could both go uninterrupted for a full two weeks...

"I think we should celebrate with a nice glass of wine" Mycroft suggested, walking through to the kitchen with your hand in his.

"We could." You agreed "oooor.... we could have some of this!" You stooped down and retrieved a 70cl bottle of Gordon's gin from the cabinet below and raised your eyebrows playfully. Mycroft seemed on board with this idea and got the tonic water from the fridge.

"I suppose because I am both the responsible one and the one dressed most like a bartender, I should be in charge of making the drinks?"

"Yeah, that makes sen- HEY! I'm responsible!" You teased, punching him lightly in the arm in mock annoyance.

"Just go and sit down the living room, I won't be long."

You smiled and squeased his arm before going to take a seat.

-an hour and a few glasses of Gin and Tonic later-

You and Mycroft had been talking non-stop. The evening was actually quite wonderful! You excused yourself for a moment to use the bathroom but when you stood up, it felt like all the blood in your legs rushed up to your head suddenly and anchored you back down to the chair.

"Woah, woah, woah... ok... Mycroft I think I'm drunk..." you looked around the room and were surprised to see the walls pulsating, almost as if the house had lungs and a heartbeat. "How- how did that happenn? We only had 2 each?..."

Mycroft rose from his chair and found himself, not walking, but rolling and meandering towards the kitchen. He returned with the 70cl bottle in his hands. His fist was clenched tightly around the neck so he didn't drop it. You exhaled in a mix between a laugh and a cough as you spied the glass vessel which he placed on the coffee table...

"You used HALF THE BOTTLE?!" you exclaimed as you dropped your jaw in shock. The hilarity of the situation, however, made your lips perk up into a bemused grin. You picked the bottle up and held it to the light but immediately felt seasick -as the clear poison sloshed around in front if your distorted vision- and were forced to put it back down.

"Well, that is a slight exaggeration... and I can hardly say this was my fault" Mycroft retorted. His voice was hilarious to you at this point because he sounded pretty much like normal other than some hyperbolic undulation when he hit a vowel. "I've never made a Gin and Tonic before so how was I to know how much to use?..." he slumped his tall body down onto a chair and laughed through his nose. The alcohol had caused an uncharacteristic pink pigmentation in his cheeks where they were usually white and cool.

"We do have ssome ssspirit measures Myc... they're in the cutlery draw!"

"I thought that just eye-balling it would be easier!..."

"MYCROFT! WE. ARE. DRUNK!!"

A silence fell between you for a few moments. You just sat and stared at the half empty bottle. The silence was broken by Mycroft laughing quietly through closed lips. Then it grew louder, provoking you to do the same. In a matter of second, you were both laughing yourselves senseless on the sofa.

After you had exhausted your humour, you both sighed and Mycroft opened up his arms and let you snuggle up against his side. The whole room syill felt like it was moving but your boyfriend felt like a landmark which grounded you to reality... you closed your eyes, floating in and out of dreamland in his arms when you muttered:

"Half the bottle... you brilliant idiot..." you smiled and drifted off into sleep fully, followed by Mycroft...