It seems like every time I need to ask a question it all turns out to be a need for recommendation....LOL

The topic has said it, these day I'm just so obsess with a novel (not BL) which has a non-canon ship but so obviously written that now I'm sad (gosh they have a BE). Please give some manga about obsessive seme/uke and if it go to an extreme like a yandere type would be even better. Thank you （/TДT)/