WEB最新章のEMTいわく「スバルが私のもの」だそうなので「スバルの嫁ｓ」じゃなくて「エミリア様とエミリア様の夫の嫁」です。

According to EMT, she's not Subaru's. Subaru is hers. So it's not Subaru's brides but rather Emilia and her gloom's bride LOL