That ending.....was the goddamn best...also, Fakku has the title wrong. It's Chibusa not Chibisa. Chibusa means Breast, hence why they call her that.
It's quite possible that all the males who (*cough, cough*) "suddenly had to take a leak", assuming they know of the 'relationship' between Chigusa and Hiro, might be thinking or saying to themselves while 'leaking': "Hiro, you Lucky Bastard!"
I really do like the artwork.
Heh, I guess his friend wasn't wrong though. He did indeed 'bust one out', but not by himself.
"Can a guy find a better lover than that"? Well...You'd certainly be hard pressed to find one, so appreciate that luck, and take good care of her.
Great ending though. Ahh...The tears of his friends who aren't Hentai protagonist. I mean, for all we know he really could be a mother fucker, but considering he mentioned his mother in the context of her not being around (ie not joining in), I doubt it.