#what the hell...

You're so right. I think he's very domestic at heart and values your comfort so much that he isn't pressed about fancy lingerie. Basic pajamas or a borrowed shirt of his are more than enough to get him going. But if you went out of your way to surprise him like that? The sentiment behind it would wreck him as much as the visual, I think: You, going out to get lingerie with the intention of wearing it for him. Trying things on, checking the mirror and deliberating over his taste. Cashing out knowing that he'd be the one to see you in this, to touch you in it, to take it off of you. Maybe wearing it to his birthday dinner or waiting on the bed in it, already wet and excited anticipating his reaction. I just think he'd feel so wanted knowing that you bought clothes specifically for him to fuck you in, and that alone would get him halfway to coming.