Maki

Artist:
https://www.pixiv.net/en/users/1054991
Source:
https://ec.toranoana.jp/tora_r/ec/item/040030821011
You can support the artist by purchasing a digital copy of the doujin from the link above!

Original manga:
https://mangadex.org/title/22615/onii-chan-is-done-for/

Support this artist by buying a copy of the original Doujin here:
https://www.dmm.co.jp/en/dc/doujin/-/detail/=/cid=d_173472/

Photo "scans" of one of Kurutsuki's last works, contributed by an anonymous user on an imageboard and shared by a Discord member
Unfortunately, it appears this artist may no longer be around,
His works on melonbooks can no longer be purchased and the artists original Pixiv page has been taken down.

Random seemingly unfinished(?) comic I found on Twitter from last year. The full comic doesn't seem published anywhere, but the currently available pages are cute.
Post seems to end here: