No he didn’t. You should reread these last chapters. Shiki was not with taka from the beginning. He was just family to taka. Shiki loved reiji, Kissjen
Maybe I was to lazy to read it so I didn't pay attention to dialogs I just saw Takamiya and Shiki kissing (〜 ̄△ ̄)〜
He's gonna get PREGNANT~~ლ(´ڡ`ლ)