the artist is Curie/キュリー (id=7432812 on pixiv), they've since deleted unfortunately.
Its a page from a manga called リョナ合同誌 (Ryona Contract?? My moonrunes aren't that great) that was sold at Comiket 88
Sadly that's all the info I have for you :(
Ty alo for the info!
Can someone post the full manga?