From TONBO's (Sei Jun) Pokemon doujin:
Since Satoshi = Anime Red, SatoKasu/PokeShipping being the anime's version of "ReKasu" (GamePokeShipping or HanadaShipping), I think this is an appropriate place to share this. TONBO seems to write his Red and Kasumi's personalities based off of their anime versions anyway, so their interaction in these scenes here feel totally like classic PokeShipping from the anime.
;P Also, awkward denial of feelings, just like Anime Kasumi.
There appears to be a two-year age gap between these two, just like Satoshi and Kasumi in the Dengeki Pikachu manga (they're the same age in the anime). Like younger guys, much? xD
Here's a PokeShippy/HanadaShippy doodle from the same guy: