Is this an ethical question, or just a pretext to be horny on main? (<— not the actual title)

Original work (pages 26-32).

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Page 1.
Young Tsukishima: Eh?

Page 2.
Tsukishima: Second Lieutenant Koito.
Koito: Ouchouchouchouch it's a joke, Tsukishima! A joke!!
Tsukishima: (You…) Please don’t do it to a kid at least 10 years younger than you*. It’s scary, even as a joke.
Koito: A kid…

Page 3.
Koito: …at least 10 years younger than you?
Tsukishima: (twitch) Ah.
Koito: Ah~ “Please don’t do it to him”, huh?
Koito: Sorry, I just couldn’t help my self. (chuckle) (pat)

Page 4.
Young Tsukishima: You guys quarreling?
Tsukishima: (Pfft) Ahh, yeah, it’s a quarrel.
Koito: Hah?

Page 5.
Koito: Wha—
Tsukishima: Apologies,
Tsukishima: I just couldn’t help myself, so.
Young Tsukishima: ? ?

Page 6.
“Two grown men who just a moment ago had been on edge with each other started a nasty kissing session. A traumatized Hajime.”
*lots of kissing and moaning sounds*
Koito: Tsukishimaan <3 Please forgive me <3
Tsukishima: No can do, sir <3 Mm.

Koito: Don’t grow up into this horrible adult okay, Hajime.
Tsukishima: (hmph)

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*Original: 十も下のガキに盛らんで下さい. Not sure what that means. Also it doesn’t specify who young!Tsukishima is at least 10 years younger than but if it *does mean* Koito it would mean young Tsukishima is about 11… do kids look that tall at 11? idk