Person A and Person B are walking down the street holding hands. Person A notices a puddle and Person B mumbles "Please don't." Person A jumps into the puddle covering Person B with muddy water.
Person A and Person B are listening to Boots With the Fur (I think that's the song name.) and when the lyrics "Give that big booty a smack." Come on Person B slaps Person A's ass.
Person A and Person B are charging their laptops. Person A pulls the charger out of the outlet and looks over to Person B. Person A says "Feel how hot this is." and Person B places their hand on Person A's shoulder.
Imagine your otp having oral sex when Person A has an orgasm and farts by accident while Person B is just laughing their head off.
(Will be continued when I get more ideas!)