The GIF explains it all

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Winter: *getting bored*

Arima: *noticed Winter being bored* *bumps her a little*

Winter: *smiles* *bumps him back*

Arima: *pushed Winter's head away*

Winter: *grabs his wrist* *moves it away but still holding it* *grabs is neck tie with her other hand*

Winter, Arima: *looks at each other* *smiles* *holds each others hand* *kissed*

Sasaki, Tesa: *prepared their camera*

Winter: *cupped Arima's face*
Arima: *wraps an arm around Winter's waist*

Sasaki, Tesa: *positioned their camera*

Winter: *wraps her arms around Arima's neck*

Arima: *puts his hand behind Winter's neck* *depends the kiss* (that's what I saw next so don't judge me)

Arima, Winter: *kissing passionately* 

Sasaki, Tesa: *took a picture*

Arima, Winter: *heard a click* *stops kissing* *looks behind them*

Winter: *looks behind* *slightly blushing*

Sasaki, Tesa: *smiles* *fangirls*

Arima: *mad*

Sasaki, Tesa: *sees a dark aura and flames around Arima* *eyes widened in horror* "..."

Winter: *looks at Arima*

Arima: *let's go of Winter* *whispers* "I'll be back Yuki" *grabs his katana called Yukinoro*

Sasaki, Tesa: *starts running away*

Winter: "fudge you guys" *blushed* *fans herself with a fan* *mentally mad at Tesa and Sasaki*

Arima: *chases Sasaki and Tesa* *scolds and yells at them*

Sasaki, Tesa: "WE'RE SORRY!!!"