Crap, I know what this is from. It's stuck at the tip of my tongue.

Thank you for whoever included the tags that this anime originated from.

Damn, she must have an eiken back.

Gamma'sUnit said:
Damn, she must have an eiken back.

Nice Pun! Lol

Rericon said:
Nice Pun! Lol

no

yes

Can't you tell? She's always using him as a boob rest to ease her back pains. That's why she's always got good posture when she does it.

albino said:
yes

no

Garyola said:
no

Stop having sex...

no shame

Alright, that's pretty funny XD