Yeah for sure, the whole Chinami in the bathtub scene also seems to add to that but... well i guess another way to explain it is i feel like Sekai is a natural born pedo groomer whereas Akira was abused into being one, it's common enough knowledge so i shouldn't need to explain how that works but the dude has a warped sense of love and how to show and receive affection and given how infantile he can become during some blackouts i reckon he's also seeking that experience of innocent childhood when/if he ends up grooming a kid. Without any information to say otherwise and some dialogue suggesting it to be the case, i would say the cycle of abuse starts with Sekai, unlike it would with, say, Sara for example, who had an abusive childhood too, if she went on to abuse Sana.
Sekai was the kind of pedo who would think "if kids didn't want to get fucked then they shouldn't be walking around being sexy all the time", whereas Akira is the kind of pedo that knows it's wrong, understands why it's wrong, but does it anyway cause sex make pee feel good. That's how it feels to me though, YMMV.
I got to say that i have a different take on the whole Chiname bathtub scene.
What first came to mind was, if this was a test for players if they want to see Chinami nude. (Testing your morals)
Then i thought about how this situation would play out in rl.
If Chinami was your blood related daughter would there even be a choice?
Unless she turns an age where she'd just bath alone. (Because she gets aware of the whole gender thing)
(Which she is not, because Chika still bathes her and she doesn't care if Akira comes in)
Things might get different if your partner brought a kid into the relationship.
The question could come up, if you'd help your partner bathing it's kid.
Then again, Chiname already claimed Akira to be her new papa.
So even that is not a problem.
In the end i had a feeling like Sel was questioning how you'd act in that situation.
Do you think it's normal or not to go in.
And i think Sel is questioning alot throughout the game, to see how people react.
Maybe he's looking for something.