I feel familiar with that line too but can't find yet. Anyway somehow I can't help thinking of last chapter of this. (≧∀≦)
http://www.mangago.me/read-manga/delivery_boy_debacle/
oh oh! i remember this one!
http://www.mangago.me/read-manga/ii_mon_waru_mon/sa/sa-v1c005/32/
that line was too funny, yet such scene was nowhere to be found, which is why i was kinda pissed off hahaha
(╯°Д °)╯╧╧
It's a line that I keep thinking for the past couple hours. "Let's have sex like bunnies." Anybody know where it's from? Thanks!