Whenever I'm reading
When I'm reading(mostly yaoi) and the main characters are already in a really really good relationship then some part of this new character appears. That makes me facepalm like "ah, here we go again" and "Damn, is this person gonna ruin some good relatio ship?". Lmao.
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Romance titles (regardless of orientation) that are more drama/slice of life always bring in a thot to ~spice things up~ right when you think the relationship of the main characters are in a good place