Who are they/what manga are they from?

They are from one of the final pages of Eroi Koto Shite Ageru. As far as I know, they are unnamed, though I may be wrong.

Ok so after looking into it some more, the page itself is from Mokkouyou Bond's Eroi Koto Shite Ageru but the characters drawn in the final pages are still unknown. Putting aside the girl with the ribbon, the girl with the ponytail seems to be 珠美 (Tamami) from 「ドゥーユーアンダスタン？」(second chapter of said tankoubon) drawn by みなかた針護(Mokkouyou Bond's assistant? I think). The additional final pages of his works always seem to be afterwords from him or comments from his assistants(congratulatory messages usually accompanied with their drawings). Though I still have no idea who the girl with the ribbon is, could be an OC, a character from his other works, or parody from existing manga drawn by his assistant(みなかた針護).