Satori peeking into Youmoe's private fantasies, eh?

No images by the artist on Danbooru before, rendered name as Tatsuku. Going to proceed with that, but leave the request tag up so someone can double check it.

The most loyal servants want to lead every once in a while, though can Youmu finish in the lead with a master like Yuyuko

The small っ in たっく basically doubles the following consonant, so it is "Ta-kku" instead of "Ta-tsu-ku."

Thanks. That would explain why the image link had takku2008 in it.