He better makes her happy or her Dad shows up and makes him regret his mistakes. And we all know who her Dad is. Dude has experience with punishing people...
Based on several clues, I think Shion & Senpai are actually complete
strangers who met (by chance) only a few hours before the chapter
begins. At that instant, she sensed his strong sex drive and decided
to ensnare him, so she cast a spell that makes him believe they have
been dating for weeks (or even months), but part of his mind senses
something is not right.
Lovely artwork, charming vanilla sex,
and wonderfully subtle storytelling.
A masterpiece.
Shion is a young succubus who's looking for real love.
That is, she wants to win Senpai's affection without
using her sexual glamour (but she cheats a little).
The story is told through a series of fascinating hints. For one thing,
Senpai seems to be somewhat dazed throughout the chapter, and
he's completely unfazed when he finds Shion schlicking in the rest-
room. Even more notably, he's not particularly perturbed when he
discovers her horn-buds. All that suggests he's under a spell.
Yet, part of his mind remains clear, because he's nagged
by the feeling something is awry, even as he submits to
Shion's erotic overtures. "Why the hell am I being so polite?"
(page 11, panel 4)
More importantly, he's vaguely baffled by the origin
of their relationship. "Actually, how'd we even start dating in the first place?"
(page 2, panel 4) "Now that I think about it, when did we even meet each other?"
(page 11)
I conclude Shion & Senpai are virtual strangers who met (by chance)
only a few hours (or minutes) before the chapter begins. Sensing his
strong sexual stamina, she cast a spell on him, in order to make him
believe they've been dating for a long time.
Note that, on page 11, panel 5, Shion is showing cat's eyes, which
(besides hinting at her true nature) suggests she's using her magic
again, to reinforce the spell she has cast on Senpai. It's an excellent
bit of visual storytelling.
Page 15 is especially delightful, as Shion plays with Senpai's precum, and toys with his cock, as if it were a musical instrument. She clearly loves everything about male sexuality.
Ah, always happy to see more Monster Girl releases!
Hmm, "Here I thought I'd be able to ignore what she really was"? Come now, you don't ignore it...You embrace it! What's there to complain about anyway? You're loved by a sweet girl, why should it matter if she's a Monster Girl...
You know, it's not often that I say this but I actually really would like a sequel. I know that it's kept ambiguous on purpose, but I'd read a more fleshed out story of these two.