I'm just so happy that Higenamuchi is back on doing what he's best at. Making cute girls that indulge themselves into a hot sex. Cheating, NTR or not he makes every genre hot!
...Fluffy collar.
Too bad she didn't just consider asking her boyfriend though, I'd think that most would be open minded to the kind of kinks their girlfriend would want to try out...Mostly anyway. But hey, it's Higenamuchi, and it's great to see he's still drawing the stuff he does best.
That ending though. For a second there I thought he handed her like, a coin or something, kinda like paying for a service. And also...Man, 'one time thing'? Course not, these never end after just...one session.
You shouldn't try to find rationnal reasoning in a hentai. In the first place, it's not like she's a decent woman to even consider doing this kind of stuff behind her boyfriend's back. Just the usual dirty, lying slut you need in many ntr or cheating h-stories.