The "Border" was not the only thing Broken here ... male protagonist got his illusion about how a first time sexual encounter should be broken harder (AND better) than would have been done by that kid from Academy City with an unwanted harem and an unlucky right hand ... and in the end Hey Mikey - I Think He Likes It."
Cheating scenarios ain't really my thing, but can't help thinking, now that the siblings-in-law's switches have been flipped, they have no choice but to abide by the words of (the late) M.J.'s:
This one should come armed with a disclaimer: "Artist, Publisher & Licensor disclaims any responsibility or liability if Yousuke's 'taking chaarge' strategy as depicted herein leads to breakup, assault charges, ostracism from society, and the like, in real life."
IF this is a case of "art imitating life", let's see how fast one of us will close up shop in whatever part of the world they're in right now and emigrate to Japan, with an employment application already prepared and sent to Waniyama ... I mean, Wani Publishing.
As for Kawabata-kun ... "You LUCKY BASTARD (grr)!!!!!"
And just a little while ago, I was noting how the female protagonist in Minakuchi Takashi's debut work here on FAKKU volunteered to "take responsibility" ... here it gets thrown back onto the male. No matter, ... Aki-nee now has a "lethal weapon" of a dick she's totally hooked on, Yuu-chan has finally lost his virginity (even if he wasn't originally aiming for his 'Sexy Onee-san' childhood friend), and, if I dare speak generally, we the readers are satisfied with Ichinose Land's debut on FAKKU.
A "Win-Win" Scenario for just about everybody ..... APPROVED!
It's a rare occurrence indeed when the female in such a (a-hem) situation volunteers to "take responsibility", but as long as there were no eye-witnesses or drones in the sky while the fox-spirit was in her child-like state, the male protagonist should be fine.