ShonenAi_Isekai'Manhua

Song Xiao only wanted to be a man of virtue, but somehow ended up being forced into a marriage with his Highness, plotted by the cunning emperor himself. However, just as the generation of great businesses began to flourish, the emperor died... When Song Xiao opened his eyes again, he finds himself in a college entrance exam... but why does his seatmate look so familiar?!
His Highness: ?_? Let me copy your homework.
Song Xiao: ...

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Fang Qi, a modern Taoist, was transported to another world following an alchemy accident, a world dominated by demons. It was then that he decided to become a demon exterminator. Upon awakening, he finds himself spending the night with a demon in a bridal chamber, where inexpressible things are happening there. Yu Ying, fragile and tiny being transforming into a majestic adult demon