Marriages of convenience are common among gods, but love marriages also exist among them. In the case of Mortavita and Giri it was a marriage of convenience on Giri's part and love on Mortavita's part.

Annnnnnnnnd about Shuun yep he is, but He was actually one of the very few who were chosen preferentially and not randomly as is common, Shuun is living proof of the marriage of Mortavita and Giri, since after being engaged, Giri together with Mortavita created Shuun as proof from this.

Shuun is not necessarily Mortavita's "son"; However, she was a participant in his creation, granting her his blessing, so technically, yes, he is one of the blessed ones.

(￣ω￣)