User blog comment:B214/Volume 23 discussion blog/@comment-31137559-20170410191626/@comment-10330822-20170411185413

He may get Serafall too for all we know. We have no idea if the Satans are going to be released and what's happening afterwards.

Roygun makes sense with her shotacon feelings and Issei's attraction to older women. I just feel her blatant flirting caught him off guard. She might actually join his peerage by the end of this.

As for Gabriel, I'm not entirely sure their child would be a miracle child. He'd be a Nephilim, a devil/angel hybrid, as far as we know miracle children are only angel/human hybrids. The same is true for Shin Shidou from EX.Chan

Chances are Issei could make Gabriel fall for him and take her into a "interdimensional room" like Irina has and have a child with her. Thus, she wouldn't fall and Issei would win the "Man of the Year" award and Azazel's eternal jealousy.