To be honest... that was my first kiss
Unless Mari and his other friend snaps him out of it no, Shizuka's got him wrapped up.this is an insane amount of psychological manipulation, i wonder if he'll ever realize that he's being groomed
That's most likely her endgame imo. Previous chapter i commented something similar, that she's going to ruin his experience with other girls and set herself up as the only one suitable for her onii-chan.That’s some 4D chess right there, using her friend as a foil and excuse to “practice”. I wouldn’t be surprised if she’s also using her friend to show that she’s the best partner.
While the mangaka is 100% pro blood related incest, I don't know. Their relationship as of right now is extremely toxic. They need a serious heart to heart to have a healthier relationship, and maybe that will happen, but as of right now, I can only see this ending really, really badly.(I fully EXPECT this author to deliver a brother-sister conclusion, at least based on their previous works, so I'm not particularly worried....)