Cozy Videogames Night In

As the evening starts, you set up your gaming station. Dim the lights and set up some candles for added warmth and coziness. You both love video games, so it's a regular gaming night - or so your partner thinks.
Just as you get ready to start playing, you strut into the room, dressed up as a character from your chosen video game. You act clearly surprised that they're already starting to play without you, showing off your 'new avatar'. As the game starts, it's clear this isn't your regular gaming night. You flirt, tease, and bet with each other as you play.
As the night progresses, the stakes get higher. Maybe the loser of each round has to take off an item of clothing. Maybe they get a sensual massage from the winner. Whatever it is, let the game dictate the pace and lead you on to more erotic fun.

First, pick out a video game you both enjoy playing. Then, choose a character from the game and plan your outfit around them. Don't worry, you can keep it simple - no need for expensive or elaborate costumes. Even just borrowing their color scheme can be enough.
Next, prepare your gaming area. Dim lights, cozy blankets, and a few candles can transform any room into a romantic gaming den. If possible, set up the gaming station near your sofa or bed where comfy cuddling can easily lead to more intimate moments.
Lastly, set up the rules of your game-ified foreplay. Discuss it with your partner beforehand or surprise them as you start playing. Be clear about the terms and remember: The goal isn't to win, but to have fun and build up sexual tension.

Remember, the key is to build up the sexual tension slowly. It's about enjoying each other's company, having a fun game night and gradually making it more intimate.
You don't need an elaborate, expensive costume to make this scenario work. Sometimes a mere suggestion, like wearing the same color scheme as your video game character, works well too.
Finally, don't worry too much about the game. It's just a tool to help you break the ice and set the stage for more intimate moments. Focus more on spending quality time together, teasing and having fun with each other.