Sister-in-Law, I've Been Waiting for You to Divorce for Ages

There are two things Gu Wenyao wants in this life: the marquisate his older brother is about to inherit, and his brother's newly-wed wife, his sister-in-law, Mo Shuqing. Mo Shuqing once stayed with the Gu family for a time when she was young. Because they were betrothed as children, she took on the role of an elder sister to Gu Wenyao, whose birth mother had died when she was little. She looked after her so attentively that she would have had Gu Wenyao sit on her lap and fed her every bite. Perhaps they'd been too close as children. So when Gu Wenyao grew up and asked to bathe in the same tub with her, only to be refused, she looked so hurt and dejected, as if the sky had fallen. With a miserable expression and red-rimmed eyes, she asked pitifully, "Are you going to abandon me too?" Mo Shuqing's heart softened, and she let her into the tub. Who could have guessed that Gu Wenyao would slip into her arms like a fish, wrap her arms around her slender waist, and ask over and over in a soft voice, the corners of her eyes red, "Wouldn't it be wonderful if you married me? I can make you happy too." Mo Shuqing stared at her hands in silence: ...? (Say that again. Which one of us is making the other happy?) Mo is the gong and Gu is the shou. They have no familial relationship whatsoever, and while their relationship exists in name only, they have no physical intimacy. Pure sweetness, both are each other's first and only, a sweet bedtime read. Theme: Go after what you want.