Sacchan to Ken-chan wa Kyou mo Itteru - Vol. 1 Ch. 4 - My girlfriend is toying with me.

[MangaDex]

 

[phil777]

Poor guy.

 

[aveney41]

I don't feel for him one bit! I'm not jealous at all

Anyway, that baby but gag actually sent me. That was pretty good.

 

[XenoAshura]

she's such a troll.

 

[genR]

That doesn't seem like it would be in any way plausible, but I haven't seen enough baby butts to contest it.

 

[Tony_Mushah]

Ken-san after knowing that the boobs photo is fake:

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Seriously, it was a good prank