This is a patreon NTR requested work that took a long while, here's Mahiru Shiina from The Angel Next Door Spoils Me Rotten (お隣の天使様にいつの間にか駄目人間にされていた件). Lots of GB and R elements.
This is a fictional parody scenario where all characters are depicted as ages 21+

https://www.pixiv.net/en/artworks/140796801
https://twitter.com/aakanecchi
https://www.patreon.com/Akanecchi
https://akanecchi.fanbox.cc/

Available on payhip: https://payhip.com/Akanecchi