http://a.mpcdn.net/manga/p/24585/498327/4.jpg
or know the artist?
Looks like Gii (the seme). I remember reading their story in the manga http://www.mangago.me/read-manga/ai_to_yokubou_wa_gakuen_de/
But forgot which chapter.
I've seen several comments about 'Wouldn't the mom's business go back down the drain now that her son and the demon are gone?' the thing to remember is that while she needed her son and the demon for a while, once her company was on an actual stable ground they were no longer needed, which is when she decided to stop using her son and the demon could take him away. ( ̄へ ̄)Terrible mom is still terrible, but hopefully that makes sense to those who didn't understand what was going on.