I feel like, at times, we might forget that parts of this game might be more like... interpretations of things not supernatural but more like hallucinations or altered mental states. Like, i'm more keen to lean on Sekai 'taking control' and making Akira kiss Yumi being less literal, Sekai is his abuser, his groomer, the ghost of his trauma, in a broken headcase like him, that situation with Yumi could cause flashbacks of his trauma and in that altered state, he'd just be on autopilot, copying what was done to him but to her. Like, i know with all the timelooping stuff there's got to be more to this than it turning out he's just a dude in a psychward dealing with his insanity, that'd be the lamest cop-out of an ending Selly could go for, but always assuming shit is exactly what it is on face value kind of strikes me as going too far the other way, some of the shit he does and goes through has got to be manifestations of his abuse trauma... replicating past experiences is beyond common in long term abuse victims, particularly those abused in their formative years, i myself enjoy getting physically hurt in the bedroom as a form of twisted and soothing replication of all the times my father beat the shit out of me growing up.
I suck at this theory stuff but sometimes i think sucking at it might offer some unique insight, sort of a situation of seeing the forest for the trees, even a broken clock is right twice a day. Is this one of those times?