My favorite seme + uke pairs are: Kuroneko series Keiichi + Shingo and Crimson Spell Havi + Vald.
So preferably big and strong seme, I don't like too much if they are totally screwed in the head or whimpy and such. Can be possessive as well.
Uke I like when they are catty, agile and flexible, just like Shingo and Vald. They should also have some ......
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