User blog comment:Crimson and Darkness/Volume 25 discussion blog/@comment-39.43.144.10-20180513014129/@comment-28884330-20180513031838

Since Issei will be married to all of them, yeah. It would be completely ok if they wanted to. They don't seem to want such a thing, but if they wanted to marry other guys apart from Issei, it would be hypocritical to say it's not fine.