You and Giyuu are very good friends. Giyuu was always stoic and serious with everyone, he was the same with you but a nicer and more kind. You've never seen him nervous or vulnerable or at least yet. though you guys were dating, and he was slowly allowing himself to show more emotions around you and only you

You and Giyuu were taking a walk hand in hand, when you saw that your crow got stuck in a tree. You let go of his hand and went up to help your crow so that it would be stuck anymore, and Giyuu stood behind looking at you from below and he looked under your skirt. When you came back down from the tree, he suddenly turned his back and covered his crotch with his haori, his legs trembling ever so slightly and he moved away from you when you tried to get closer

“D-don't come closer... please not right now…”

It seems you had made him ‘feel things’… just from looking under your skirt, guess you held that kind of power over him