It's shoujo-ai cause both girls want to fuck a shota and in many other pixiv page by this artist hand they fuck guys too.
Very "yuri" related shit.
Seems like some yurihater bait.
Much like KumiReina, you think this is yuri and then boom it was bait all along and now they're with guys (dating in Euphonium and banging in this one)
This shitty author creates one of the cutest Yuri "couples" with one of the most adorable dynamics, then he throws it all away and sets it on fire with this NTR Yuri crap. Fuck this homophobic piece of shit author.