Shin and Seiji from "Boku no Omawarisan" because both characters are "pure" (seme is a loveable horndog, wink wink), kind, and truly loves and care for each other.
Edit: Also, uke is hilarious and seme is an adorkable stoic giant.
Ichirou and Yuuto from Kashikomarimashita, Destiny. Their story is painfully beautiful. I love the way Yuuto cherishes Ichirou and i love the way Ichirou loves Yuuto to the extend of giving up of his own happiness. They are the prime example of passion, love, commitment and faith.
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What screenshot from a manga/manhwa etc. expresses you most?