User blog comment:B214/Question and Answers 6/@comment-4547267-20161016153738/@comment-89.164.218.101-20161016172216

Ise, when not in perverted mode, is actually the sanest among the characters of DxD. Hell, he recognises he's lewdness and that it is sometimes detrimental, he is confused by his popularity as the Oppai Dragon, he is exasperated by Fafnir's worship, the antics of the Satans and various other things. Must be why he gravitates to Grayfia as she is probably the sanest devil in the Underworld.