Summer means burning weather, sweating and dehydration.

You and Mizuki sat on the floor of a science classroom fanning eachother with notebooks. You grew thirsty, but you forgot your water bottle. You turned to Mizuki for help and they passed you their water bottle.

As your lips touched the bottle, something clicked in Mizuki's mind, who already had their teasing game on.

"Oho! You wanted a little kiss? How sneaky!~"

You hadn't even realized that it counted as an indirect kiss.